Maximum Intensity Projection Research Articles

Computational wide-field imaging of poplar embolism and wound-response with a deployable microscope.

Low-cost, minimally invasive microscopy for tracking cellular dynamics in living plants within their natural ecosystems is crucial for addressing fundamental questions in plant ecology and biology. However, existing solutions are constrained by coarse resolution, limited field-of-view (FoV), and poor deployability in natural settings. Here, we utilize a compact, portable microscope ("miniscope") for label-free (autofluorescence) imaging in living poplar wood. We systematically implement and evaluate multiple computational methods to enhance resolution and FoV. Our optimal computational pipeline, comprising maximal intensity projection, deconvolution, and flat-field correction, increases resolution by up to 39% on-axis and up to 49% at the field edges, resolving features of 2.87 μm, averaged over a FoV of ∼1mm (diameter), compared with a 4.34 μm baseline. We demonstrate microscopy within the tissue of a living poplar plant in our greenhouse, observing the embolism of vessel elements, wound response, and tissue deformation from moisture evaporation.

Qualitative and quantitative analysis of reduced bed position acquisition time on FDG PET image quality.

The study aim was to evaluate whether reducing bed position acquisition time would result in significant detriment to image quality. Secondary aims were to compare effect of time of flight (TOF) and Q.Clear reconstructions and patient BMI on image quality. Fluorodeoxyglucose PET-CT performed in 30 patients on a new scanner at our institution between March and May 2024 was retrospectively evaluated. Four PET reconstructions were performed: (a) 1 min 45 s TOF, (b) 2 min TOF, (c) 1 min 45 s Q.Clear, and (d) 2 min Q.Clear. For qualitative analysis, four maximum intensity projection images were evaluated side-by-sideusing a five-point visual score (1 = non-diagnostic, 5 = excellent). For quantitative analysis, liver signal-to-noise ratio (SNR) was calculated. A statistically significant reduction in visual score occurred when reducing bed position time from 2 min to 1 min 45 s (mean TOF scores 0.24 reduction, P = 0.0002; mean Q.Clear scores 0.04 reduction, P = 0.02. There was also a statistically significant difference in liver SNR when reducing bed position time. Deterioration in image quality was minimised when bed position acquisition time was reduced if Q.Clear construction was utilized. This could facilitate increased scanning capacity without clinical detriment.

Association of thrombus enhancement with mortality following endovascular therapy in patients with acute anterior circulation stroke

BackgroundThrombus enhancement sign (TES) has emerged as a potential imaging biomarker in patients with acute ischemic stroke (AIS) undergoing endovascular thrombectomy (EVT).ObjectiveTo evaluate the prognostic value of TES on 90-day...

Hematuria in the ER patient: optimizing detection of upper tract urothelial cancer - A pictorial essay.

Upper tract urothelial carcinoma (UTUC) is a rare and challenging subset of the more frequently encountered urothelial carcinomas (UCs), comprising roughly 5-7% of all UCs and less than 10% of all renal tumors. Hematuria is a common presenting symptom in the emergency setting, often prompting imaging to rule out serious etiologies, with UTUC especially posing as a diagnostic challenge. These UTUC lesions of the kidney and ureter are often small, mimicking other pathologies, and are more aggressive than typical UC of the bladder, emphasizing the importance of timely and accurate diagnosis. Multidetector computed tomography urography (CTU) is the standard imaging modality for diagnosis, tumor staging, and surgical planning. Various postprocessing techniques like multiplanar reconstructions, maximal intensity projection (MIP) images, and 3D volumetric rendering technique (VRT) are crucial for accurate detection. In addition, 3D cinematic rendering (CR) is a novel technique that employs advanced illumination models, producing images with realistic shadows and increased surface detail, outperforming traditional VRT. We willreview the distinctive imaging features between UTUC and infiltrating mimicking lesions on CTU in patients who presented with hematuria, in conjunction with advanced postprocessing techniques,ultimately improving diagnostic confidence and preoperative planning in the emergency context.

Effectiveness of 4-dimensional maximum intensity projection (4D-MIP) for respiratory motion management with uncertain interobserver delineation.

This study was conducted to evaluate the use of 4-dimensional (4D) maximum intensity projection (4D-MIP) to compensate for the disadvantages of average intensity projection (AIP), which is used to determine the internal target volume (ITV) in lung tumors. A respiratory motion phantom with a simulated tumor was imaged using 4D computed tomography (4D-CT). AIP and 4D-MIP were generated based on 10 phases of 4D-CT, followed by contouring of the ITVAIP and ITVMIP; these were compared with the ITV contoured in 10 phases of 4D-CT (ITV10). Additionally, the profile curves of the ITVAIP and ITVMIP were obtained, and the full width at half maximum (FWHM) was measured. There was no significant difference between the ITV10 and ITVMIP; however, the ITVAIP demonstrated a lower value. The FWHM values of the ITVAIP were smaller than those of ITVMIP owing to decreased CT values in the superior-inferior margin. 4D-MIP may contribute to improving the consistency of the ITV delineation.

Attempt to Improve MIP Image of Cerebrovascular MRA by Subtraction Method: Efficient Acquisition of Mask Images Using Segmented TOF and Compressed Sensing

The aim of this study was to investigate imaging conditions that allow for the rapid acquisition of mask images used in the subtraction method, one of the depiction improvement methods for brain magnetic resonance angiography, by employing compressed sensing (CS) combined with segmented time-of-flight (TOF). The experiment was performed on healthy volunteers using 3.0T-MRI. We examined the blood flow signal suppression effects in arteries and veins at different numbers of segments. We determined the flip angle at which the signal value of fat in the mask image became equivalent to that in the angio image. We visually assessed the impact of mask images with varying CS factors on subtraction images and determined the optimal CS factor. Effective blood flow signal suppression in arteries and veins was achieved with segment numbers of 12 or fewer, and a flip angle of 18° resulted in equivalent fat signal values. Even with a CS factor set to its maximum value of 12, no degradation in image quality was observed in the maximum intensity projection images. Using segmented TOF with CS, optimal imaging conditions for acquiring mask images for the subtraction method were determined to be segment number 9, flip angle 18°, and CS factor 12.

Reconsideration of the horizontal tube-shifting technique in the intraoral radiography of maxillary molars.

The horizontal tube-shifting technique can be adopted to separate overlapping buccal roots of the maxillary molar from the palatal root. A simulation study was performed to determine an appropriate tube-shift angulation when adopting three-dimensional computed tomography imaging. Cone-beam computed tomography images of 21 volunteers were used for simulation. Adopting image analysis software, maximum intensity projection (MIP) three-dimensional images of maxillary molars observed from directions similar to the direction of an intraoral radiography X-ray beam were reconstructed. The orthoradial projection angle was taken as the baseline and the tube-shifting technique was then simulated to separate superimposed buccal roots from the palatal root. The tube-shift technique was considered applicable to maxillary molars for 29/42 teeth (69%) in the case of a mesial tube shift and 40/42 teeth (95.2%) in the case of a distal tube shift. The specific shifting angle suitable for observing the buccal root apex of the maxillary molar without overlapping was obtained.

Symptomatic Intracranial Atherosclerosis in an Australian Context: Common and Underdiagnosed in Multiple Ethnic Groups

BACKGROUND Intracranial atherosclerosis (ICAD) is a common cause of stroke globally. We calculated the proportion of patients with stroke with symptomatic intracranial atherosclerosis in an Australian multiethnic setting, as well as diagnostic rates by stroke physicians and radiologists. METHODS This was a multicenter retrospective cohort study based in Melbourne, Australia. Demographic data (including self‐reported ethnicity) and data on vascular risk factors were collected. Symptomatic ICAD was independently identified by 2 blinded stroke neurologists using multiplanar reformats and maximum intensity projections of routinely acquired thin slice computed tomography angiography data, with disagreements resolved by a third blinded stroke neurologist. This diagnostic reference standard was compared to the proportion of patients with ICAD identified in the radiology report and stroke team clinical notes. RESULTS Of 1328 patients included (mean age, 73 years; 43% female), the proportion of patients with centrally read symptomatic ICAD was 14%, of whom 39% were diagnosed by the stroke clinical team and 65% by the reporting radiologist. Patients of Asian ethnicity more commonly had symptomatic ICAD than patients of European ethnicity (21% versus 14%; odds ratio, 1.5 [95% CI, 1.0–2.23]). CONCLUSION Intracranial atherosclerosis is common and underdiagnosed in an Australian tertiary stroke care unit setting in patients from multiple ethnic backgrounds.

The combination of focal breast edema and adjacent vessel sign to assess the behavior of mass-type invasive ductal carcinoma

BackgroundThe objective of this study was to investigate the association between focal breast edema (FBE) and adjacent vessel sign (AVS) with tumor size, histologic grade, lymphovascular invasion, axillary lymph node status, Ki-67 index, and molecular subtype in breast cancer. These findings have provided valuable insights into the biological characteristics and prognosis of mass-type invasive ductal carcinoma (M-IDC).MethodsWe retrospectively included patients with M-IDC between January 2016 and December 2021. FBE was evaluated using T2-weighted sequence. AVS was assessed using maximum-intensity projection images obtained using early dynamic contrast-enhanced magnetic resonance imaging. The breast peritumor score (BPS) was defined as follows: BPS 1, absence of both edema and AVS; BPS 2, AVS without edema; BPS 3, AVS with peritumoral edema; BPS 4, AVS with prepectoral edema; and BPS 5, AVS with subcutaneous edema. The correlation between different BPS scores and clinicopathological variables was examined using Kendall’s tau-b correlation coefficient. The DeLong test was used to compare the performances of three clinicopathological models combined with peritumoral features (FBE, AVS, and BPS) in predicting luminal A-like M-IDC.ResultsIn 228 patients with M-IDC, BPS was positively correlated with tumor size, histologic grade, lymphovascular invasion, axillary lymph node status, Ki-67 index, and negatively correlated with estrogen receptor expression (all P < 0.05). Furthermore, BPS 1 was more likely to be present in patients with luminal A-like breast cancer (P < 0.001). Among the three prediction models, the clinicopathological model combined with the BPS model demonstrated superior diagnostic performance for luminal A-like breast cancer.ConclusionsThe BPS is a valuable, non-invasive biomarker for assessing the aggressiveness of M-IDC and can facilitate treatment planning.

The blind spots on chest computed tomography: what do we miss.

Chest computed tomography (CT) is the most frequently performed imaging examination worldwide. Compared with chest radiography, chest CT greatly improves the detection rate and diagnostic accuracy of chest lesions because of the absence of overlapping structures and is the best imaging technique for the observation of chest lesions. However, there are still frequently missed diagnoses during the interpretation process, especially in certain areas or "blind spots", which may possibly be overlooked by radiologists. Awareness of these blind spots is of great significance to avoid false negative results and potential adverse consequences for patients. In this review, we summarize the common blind spots identified in actual clinical practice, encompassing the central areas within the pulmonary parenchyma (including the perihilar regions, paramediastinal regions, and operative area after surgery), trachea and bronchus, pleura, heart, vascular structure, external mediastinal lymph nodes, thyroid, osseous structures, breast, and upper abdomen. In addition to careful review, clinicians can employ several techniques to mitigate or minimize errors arising from these blind spots in film interpretation and reporting. In this review, we also propose technical methods to reduce missed diagnoses, including advanced imaging post-processing techniques such as multiplanar reconstruction (MPR), maximum intensity projection (MIP), artificial intelligence (AI) and structured reporting which can significantly enhance the detection of lesions and improve diagnostic accuracy.

Early radiological reduction of periventricular anastomosis after direct bypass surgery for adult moyamoya disease.

Periventricular anastomosis (PA), a recently recognized cause of hemorrhage in moyamoya disease, is reducible after bypass surgery. The timing of the reduction, however, remains poorly understood. The objectives of the present study were to demonstrate radiological reduction of PA occurring within 48 hours after surgery and to identify factors associated with reduction. This retrospective cohort study included patients aged 16 years or older who were diagnosed with moyamoya disease and underwent direct bypass surgery. PAs were assessed using sliding thin-slab maximum intensity projection MR angiography images acquired before surgery and on postoperative day 1. The signal ratio of PA, the ratio of the signal value of the medullary artery to that of the brain parenchyma, was measured at the same point on automatically aligned baseline and postoperative images. The location of bypass was defined as either targeted or nontargeted to the PA. A total of 68 PAs were analyzed. The signal ratio of PA significantly decreased (mean change [95% CI] -0.16 [-0.21 to -0.11]), while that of cerebellar arteries increased (mean change [95% CI] 0.20 [0.09-0.31]). The interrater reliability measurement of the signal ratio change was excellent (intraclass correlation coefficient 0.94). Multivariate linear regression analysis revealed that targeted bypass (regression coefficient [95% CI] -0.1063 [-0.1558 to -0.0569]) and cross-sectional area of the donor artery (regression coefficient [95% CI] -0.1317 [-0.2101 to -0.0534]) were significant factors contributing to signal reduction of the PA. Analysis of the receiver operating characteristic curve revealed that early signal reduction well predicted late-phase reduction (area under the curve 0.78). PA could be reduced within 48 hours after direct bypass surgery, suggesting an early preventive effect against hemorrhage. Early reduction, a potential predictor for late-phase reduction, might be promoted by targeted bypass surgery.

Pyramidal neurons of CA1 neuron in organotypic slice

AbstractThis is a maximal intensity projection of CA1 pyramidal cell transfected with plasmid with the reporter GFP using single cell electroporation technique. In this particular case the organotypic slices were prepared from p5‐7 pups in a tissue chopper (McIlwain). And maintained in MEM bases media with added glutamax with a change in 2 alternative dyas at 37°C and 5% CO2 for 4 days in‐vitro (DIV) before electroporating with a glass pipette of 7‐10mΩ resistance by applying 4 square pulses of ‐ve voltage of −2.5 V, for 25 ms duration at 1 Hz frequency. Then maintained in the same medium for one four more days before fixing them in PFA(4‰ v/v) and amplified with anti‐GFP antibody (ab290, 1:1000 dil) and imaged in SP2 confocal microscope (Leica) for z‐stack.

Clinical and Imaging features associated with malignant focal non-mass enhancement on breast MRI

Introduction: Focal non-mass enhancement (NME) is a common breast MRI finding with limited data to guide management. This study aimed to assess clinical and imaging features of malignant BI-RADS 4 focal NME. MethodsThis IRB-approved, retrospective study included breast MRI exams between August 1, 2013 and September 1, 2022 yielding BI-RADS 4 focal NME lesions that underwent core biopsy or excision with available pathology result or demonstrated decrease or resolution during follow-up MRI or at least two years of MRI stability. ResultsA total of 296 BI-RADS 4 focal NME lesions in 246 patients were included in the study. The overall malignancy rate of BI-RADS 4 focal NME was 36/296 (12.2%). Focal NME in a patient presenting for evaluation of extent of disease or other diagnostic concern was 5.5 and 3.4 times more likely, respectively, to be malignant compared to focal NME seen on a high-risk screening exam. There was also a significant association between malignancy and focal NME that was brighter than background parenchymal enhancement (BPE) on maximum intensity projection (MIP) images. There was no significant association between malignancy and lesion size, internal enhancement pattern, amount of BPE, amount of fibroglandular tissue, or signal intensity on T2-weighted images. ConclusionOur study yielded a malignancy rate of 12.2% for BI-RADS 4 focal NME lesions. Indication for MRI and signal intensity compared to BPE on MIP images were features associated with malignancy that may provide guidance on the management for focal NME. Micro abstractFocal non-mass enhancement (NME) is a common breast MRI finding with limited data to guide management. In this rertospective study of 296 BI-RADS 4 focal NME lesions in 246 patients, 36/296 (12.2%) were malignant. Lesions were more likely to be malignant if they were brighter than background parenchymal enhancement or if the exam was a diagnostic, rather than screening, exam.

Lung nodule localization and size estimation on chest tomosynthesis.

We aim to investigate the localization, visibility, and measurement of lung nodules in digital chest tomosynthesis (DTS). Computed tomography (CT), maximum intensity projections (CT-MIP) (transaxial versus coronal orientation), and computer-aided detection (CAD) were used as location reference, and inter- and intra-observer agreement regarding lung nodule size was assessed. Five radiologists analyzed DTS and CT images from 24 participants with lung , focusing on lung nodule localization, visibility, and measurement on DTS. Visual grading was used to compare if coronal or transaxial CT-MIP better facilitated the localization of lung nodules in DTS. The majority of the lung nodules (79%) were rated as visible in DTS, although less clearly in comparison with CT. Coronal CT-MIP was the preferred orientation in the task of locating nodules on DTS. On DTS, area-based lung nodule size estimates resulted in significantly less measurement variability when compared with nodule size estimated based on mean diameter (mD) ( ). Also, on DTS, area-based lung nodule size estimates were more accurate ( ) than lung nodule size estimates based on mean diameter ( ). Coronal CT-MIP images are superior to transaxial CT-MIP images in facilitating lung nodule localization in DTS. Most found on CT can be visualized, correctly localized, and measured in DTS, and area-based measurement may be the key to more precise and less variable nodule measurements on DTS.

Validation of an Artificial Intelligence-Based Prediction Model Using 5 External PET/CT Datasets of Diffuse Large B-Cell Lymphoma.

The aim of this study was to validate a previously developed deep learning model in 5 independent clinical trials. The predictive performance of this model was compared with the international prognostic index (IPI) and 2 models incorporating radiomic PET/CT features (clinical PET and PET models). Methods: In total, 1,132 diffuse large B-cell lymphoma patients were included: 296 for training and 836 for external validation. The primary outcome was 2-y time to progression. The deep learning model was trained on maximum-intensity projections from PET/CT scans. The clinical PET model included metabolic tumor volume, maximum distance from the bulkiest lesion to another lesion, SUVpeak, age, and performance status. The PET model included metabolic tumor volume, maximum distance from the bulkiest lesion to another lesion, and SUVpeak Model performance was assessed using the area under the curve (AUC) and Kaplan-Meier curves. Results: The IPI yielded an AUC of 0.60 on all external data. The deep learning model yielded a significantly higher AUC of 0.66 (P < 0.01). For each individual clinical trial, the model was consistently better than IPI. Radiomic model AUCs remained higher for all clinical trials. The deep learning and clinical PET models showed equivalent performance (AUC, 0.69; P > 0.05). The PET model yielded the highest AUC of all models (AUC, 0.71; P < 0.05). Conclusion: The deep learning model predicted outcome in all trials with a higher performance than IPI and better survival curve separation. This model can predict treatment outcome in diffuse large B-cell lymphoma without tumor delineation but at the cost of a lower prognostic performance than with radiomics.

The role of 3D cinematic rendering in the evaluation of upper extremity trauma.

Traumatic upper extremity injuries are a common cause of emergency department visits, comprising between 10-30% of traumatic injury visits. Timely and accurate evaluation is important to prevent severe complications such as permanent deformities, ischemia, or even death. Computed tomography (CT) and CT angiography (CTA) are the favored non-invasive imaging techniques for assessing upper extremity trauma, playing a crucial role in both the treatment planning and decision-making processes for such injuries. In CT postprocessing, a novel 3D rendering method, cinematic rendering (CR), employs sophisticated lighting models that simulate the interaction of multiple photons with the volumetric dataset. This technique produces images with realistic shadows and improved surface detail, surpassing the capabilities of volume rendering (VR) or maximal intensity projection (MIP). Considering the benefits of CR, we demonstrate its use and ability to achieve photorealistic anatomic visualization in a series of 11 cases where patients presented with traumatic upper extremity injuries, including bone, vascular, and skin/soft tissue injuries, adding to diagnostic confidence and intervention planning.

Is an all-phase ITV (internal target volume) a gold standard in the target definition of hepatocellular carcinoma?

Stereotactic ablative body radiation (SABR) is a well-recognized treatment option for hepatocellular carcinoma (HCC). Due to the inherent motion of liver tumors, effective motion management is crucial for successful SABR. In the motion-encompassing motion management technique, all 10 respiratory phase image datasets are delineated and designated as the internal target volume (ITV). Some treatment centers use single or combination image sets to delineate the target volume. This study determines which specialty image set most closely matches an all-phase ITV contour on a synchronized contrast-enhanced 4DCT. Synchronized 4DCT contrast and delayed scans were acquired for 10 patients in the study. The maximum intensity projection (MiP), average intensity projection (AvgIP), and minimum intensity projection (MinIP) images were generated. The ITV delineation was done in all 10 phases (ITV_all_phase). The ITV_2phase combines the peak inhale and exhale phase, ITV_2M combines MiP and MinIP, and ITV_3M combines MiP, MinIP, and AvgIP. All ITVs were compared to ITV_all_phase with Dice similarity index (DSI) and volumes. Using ITV_all_phase as the reference, the DSI and the mean ITV volumes for the different ITVs were as follows: ITV_all_phase (1 and 116.69 cc), ITV_2phase (0.87 and 105.27 cc), MiP (0.76 and 98.24 cc), AvgIP (0.72 and 94.54 cc), ITV_MinIP (0.67 and 81.08 cc), ITV_2M (0.84 and 106.26 cc), and ITV_3M (0.86 and 112.51 cc). The study demonstrates that in the motion-encompassing technique of motion management, the target volume generated by delineating all phases of 4DCT provides the most accurate representation for patients with HCC. Specialty image sets and their combinations, while sometimes close, tend to result in less accurate targeting. Hence, the all-phase 4DCT method should be preferred to avoid geographical misses and ensure optimal treatment outcomes. However, our conclusion may be limited by the technique we employed.

Peripheral Non-Contrast MR Angiography Using FBI: Scan Time and T2 Blurring Reduction with 2D Parallel Imaging.

Non-contrast magnetic resonance angiography (NC-MRA), including fresh blood imaging (FBI), is a suitable choice for evaluating patients with peripheral artery disease (PAD). We evaluated standard FBI (sFBI) and centric ky-kz FBI (cFBI) acquisitions, using 1D and 2D parallel imaging factors (PIFs) to assess the trade-off between scan time and image quality due to blurring. The bilateral legs of four volunteers (mean age 33 years, two females) were imaged in the coronal plane using a body array coil with a posterior spine coil. Two types of sFBI and cFBI sequences with 1D PIF factor 5 in the phase encode (PE) direction (in-plane) and 2D PIF 3 (PE) × 2 (slice encode (SE)) (in-plane, through-slice) were studied. Image quality was evaluated by a radiologist, the vessel's signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were measured, and major vessel width was measured on the coronal maximum intensity projection (MIP) and 80-degree MIP. Results showed significant time reductions from 184 to 206 s on average when using sFBI down to 98 to 162 s when using cFBI (p = 0.003). Similar SNRs (averaging 200 to 370 across all sequences and PIF) and CNRs (averaging 190 to 360) for all techniques (p > 0.08) were found. There was no significant difference in the image quality (averaging 4.0 to 4.5; p > 0.2) or vessel width (averaging 4.1 to 4.9 mm; p > 0.1) on coronal MIP due to sequence or PIF. However, vessel width measured using 80-degree MIP demonstrated a significantly wider vessel in cFBI (5.6 to 6.8 mm) compared to sFBI (4.5 to 4.7 mm) (p = 0.022), and in 1D (4.7 to 6.8 mm) compared to 2D (4.5 to 5.6 mm) (p < 0.05) PIF. This demonstrated a trade-off in T2 blurring between 1D and 2D PIF: 1D using a PIF of 5 shortened the acquisition window, resulting in sharper arterial blood vessels in coronal images but significant blur in the 80-degree MIP. Two-dimensional PIF for cFBI provided a good balance between shorter scan time (relative to sFBI) and good sharpness in both in- and through-plane, while no benefit of 2D PIF was seen for sFBI. In conclusion, this study demonstrated the usefulness of FBI-based techniques for peripheral artery imaging and underscored the need to strike a balance between scan time and image quality in different planes through the use of 2D parallel imaging.

The Bony Nasal Cavity and Paranasal Sinuses of Big Felids and Domestic Cat: A Study Using Anatomical Techniques, Computed Tomographic Images Reconstructed in Maximum-Intensity Projection, Volume Rendering and 3D Printing Models.

This study aims to develop three-dimensional printing models of the bony nasal cavity and paranasal sinuses of big and domestic cats using reconstructed computed tomographic images. This work included an exhaustive study of the osseous nasal anatomy of the domestic cat carried out through dissections, bone trepanations and sectional anatomy. With the use of OsiriX viewer, the DICOM images were postprocessed to obtaining maximum-intensity projection and volume-rendering reconstructions, which allowed for the visualization of the nasal cavity structures and the paranasal sinuses, providing an improvement in the future anatomical studies and diagnosis of pathologies. DICOM images were also processed with AMIRA software to obtain three-dimensional images using semiautomatic segmentation application. These images were then exported using 3D Slicer software for three-dimensional printing. Molds were printed with the Stratasys 3D printer. In human medicine, three-dimensional printing is already of great importance in the clinical field; however, it has not yet been implemented in veterinary medicine and is a technique that will, in the future, in addition to facilitating the anatomical study and diagnosis of diseases, allow for the development of implants that will improve the treatment of pathologies and the survival of big felids.

Frequency of bile duct variant anatomy on MRCP on 3.0t in liver donors.

Objective: To determine the frequency of bile duct variant using magnetic resonance cholangiopancreatography (MRCP) on a magnetic field strength of 3.0 Tesla in liver donors. Study Design: Descriptive Cross-sectional study. Setting: Department of Radiology, Armed Forces Institute of Radiology and Imaging, Military Hospital Rawalpindi. Period: May 2019 to November 2019. Methods: The research comprised people who went to the hospital for magnetic resonance cholangiopancreatography. 85 liver transplant recipients between the ages of 20 and 70 were chosen for the research. According to Yoshida categorization, bile duct variation was noted. The MRCP methodology includes multiplanar imaging, maximum intensity projection pictures, thin slab axial HASTE, thick slab coronal HASTE, and T2 3D sequence. The Siemens Avanto 3 Tesla machine was used for the study. Results: The study's participants ranged in age from 20 to 70, with a mean age of 41.73 ± 10.03 years. The majority of the 54 patients (63.53 percent) were aged 20 to 45. The male to female ratio was 1:1 among the 85 patients, with 43 (50.59 percent) men and 42 (49.41 percent) women. In my research of liver donors, 57 (67.05 percent) showed normal biliary tree structure and 28 (32.95 percent) exhibited abnormalities. Conclusion: This study concluded that normal biliary tree anatomy was seen in 67.05% and 32.95% had variations in biliary anatomy on MRCP on 3.0T in liver donors.