Detection Of Foreign Bodies Research Articles

Research on Foreign Body Detection for Granular Material Based on Feature Weighted OCSVM of Color Recognition

In granular materials processing, how to efficiently recognize and remove foreign bodies is very important. Training data including H,I mean and I standard deviation of target material are distinguished to be foreign bodies or not by training model, which is established using FWOCSVM method, while taking into account the characteristics of foreign body detection. A way to introduce the weight value reflecting the importance degree of attribute with its mean square deviation is developed to solve the problem, that is, attribute weights are not considered in OCSVM. The results show that FWOCSVM has more excellent performance than that of threshold or OCSVM .And color features adopted in the paper have excellent identification performance in above foreign bodies detection.

Detection of Foreign Bodies and Bubble Defects in Tire Radiography Images Based on Total Variation and Edge Detection

We present the analysis and decomposition of tire radiography images by combining the total variation, curvelet transform based image enhancement, and Canny edge detection to detect foreign bodies and bubble defects in tires. Relying on the feature of total variation that images can be decomposed as texture parts and cartoon parts, we decompose the tire radiography image and select the cartoon part for defect detection since the textures are segmented and defect information is retained. The edges of the image are enhanced by modifying the curvelet coefficients before further edge detection operation. Furthermore, a Canny edge detection operator is used to detect the defects in which the eight-neighborhood bilinear interpolation non-maximum suppression method is employed to improve the detection performance. In our experiments, the Sobel operator and state-of-the-art methods such as the LoG operator and Canny edge detection algorithms are employed for comparison, and the experimental results are discussed briefly. The experimental results indicate that foreign bodies and bubbles in tires can be detected and located accurately by our proposed method.

Application of support vector data description to detection of foreign bodies in tobacco

It is difficult to fully collect foreign body sample in detecting foreign bodies from tobacco.A detection method based on Support Vector Data Description(SVDD) was proposed.Thus a one-class classifier can be developed by using tobacco samples soly.RGB and HSV of tobacco and several typical foreign bodies were firstly extracted;then the HV component was used as eigenvector.A developed SVDD classifier was applied to distinguish foreign bodies from tobacco by inputting the HV eigenvector.Finally through the Receiver Operating Characteristic(ROC) curve,the SVDD classifier was compared with three other methods in classification effect.The experimental results show that by adopting feature extraction with HV component,the data dimension was reduced and a higher computation efficiency was achieved.The SVDD classifier has a stronger classification ability and higher efficiency,which could distinguish foreign bodies from tobacco better.

Noninvasive photoacoustic detecting intraocular foreign bodies with an annular transducer array

We present a fast photoacoustic imaging system based on an annular transducer array for detection of intraocular foreign bodies. An eight-channel data acquisition system is applied to capture the photoacoustic signals using multiplexing and the total time of data acquisition and transferring is within 3 s. A limited-view filtered back projection algorithm is used to reconstruct the photoacoustic images. Experimental models of intraocular metal and glass foreign bodies were constructed on ex vivo pig's eyes and clear photoacoustic images of intraocular foreign bodies were obtained. Experimental results demonstrate the photoacoustic imaging system holds the potential for in clinic detecting the intraocular foreign bodies.

Retained Metallic Foreign Body in Cheek: A Diagnostic and Surgical Challenge

ABSTRACTForeign body lodged in the soft tissue is fairly common in the vehicular or industrial accidents. Traumatic injuries in orofacial region often drive foreign bodies in the soft tissues. The immediate closure of the soft tissue wounds become the emergency treatment for the control of bleeding. The foreign body may sometimes remain unnoticed. The purpose of reporting this unusual case of metallic foreign object in the cheek is to highlight the difficulties in detection of foreign bodies and discuss its clinical management. We also discuss the usefulness of various imaging modalities for assessment of its nature, location, size, shape and relation to vital structures.How to cite this articleManekar VS, Chavan A. Retained Metallic Foreign Body in Cheek: A Diagnostic and Surgical Challenge. Int J Head Neck Surg 2013;4(2):107-109.

MRI Findings of Intramuscular Foreign Body Injection: A Case Report

�There are various types of foreign body reactions, such as inflammation, edema, fluid collection, hematoma, infection, abscess and granulomas. There are various imaging findings according to types of foreign bodies and depending on the lapse of time. Therefore, correct diagnosis of a foreign body reaction is difficult and easily confused with soft tissue neoplasm. The MRI is ideal for the detection of foreign bodies regardless of radiolucency or acoustic impedance. It is especially very useful in the evaluation of the surrounding tissue reaction. The authors report a case of a 26-year-old female patient with both forearm swelling due to self-injection of a mixture of powdered tablets and saline. The lesion shows numerous internal T1 and T2 dark signal intensity micro-spots with surrounding fluid collection, which are diagnosed as foreign bodies with surrounding inflammatory changes during

Role of Imaging in the Assessment of Impacted Foreign Bodies in the Hypopharynx and Cervical Esophagus

Impaction of foreign bodies in the upper digestive tract is a serious pathologic condition in ear, nose, and throat practice and is particularly common in children, prisoners, and psychiatric patients. Commonly found objects include fish bones, chicken bones, pieces of glass, dental prostheses, coins, and needles. The goals of the initial patient assessment are to identify the type of object, its location in the gastrointestinal tract, the presence of any associated complications, and the presence of any underlying esophageal conditions. Radiographic evaluation is helpful to confirm the location of foreign bodies and associated complications. Plain films of the neck and chest commonly will show the location of radiopaque objects, such as coins. Both anteroposterior and lateral views are necessary, as some radiopaque objects overlying the vertebral column may only be visible on the lateral view. Multidetector row computed tomography is superior to plain radiographs for the detection of pharyngoesophageal foreign bodies and provide additional crucial information for the management of complicated cases especially related to sharp or pointed ingested foreign bodies.

Application of ultrasonic probe with a needle for surveying a fish bone embedded in the tongue

Detection and localization of foreign bodies within soft tissue is often difficult, particularly those in the mobile tongue. However, few reports have related definitive procedures for the removal of foreign bodies in the tongue. Computed tomography (CT) is usually utilized to detect foreign bodies, but cannot provide real-time information during removal operations. We report a case involving a fishbone embedded in the mobile tongue that was easily retrieved using ultrasonic probing with a 26-G needle as a landmark.

X-ray dark-field imaging for detection of foreign bodies in food

Conventional X-ray transmission radiography has long been used for online detection of foreign bodies in food products relying on the absorption contrast between the foreign body and food product. In this paper, we present a novel approach for detection of organic foreign bodies such as paper and insects in two food products using X-ray dark-field imaging with a grating interferometer. The ability to detect the foreign bodies is quantified using a measure of the contrast-to-noise ratio.

3D Reconstruction to Detect Fish Bones in Foreign Body Models

Objective: When fish bones are impacted in pharynx or in esophagus, it’s hard to find them with simple radiography. We designed foreign body models with fish bones and used their computed tomogram data to make 3D reconstructed images. Various modifications of 3D data were tested for foreign body detection. Method: Bones from 3 species of fishes frequently consumed in Korea were used as foreign body models. Fish bones were sandwiched between plates of fish paste. Computed tomograms taken were converted into 3D images. Multi-planar reconstruction, volume rendering, and virtual endoscopy were used to determine the characteristics of fish bones. Results: Shapes of the bones are easily reconstructed for the mandible. Gill cover and spine cannot be reconstructed perfectly. The shape could be figured out in every reconstructed image in volume rendered images after removal of soft tissue data. In measuring size, plane CT are useful in detecting margins. Volume rendered images also were suitable in measuring the size. The location of the foreign bodies could be easily measured if the reference point is given. The axial CT image or 3D images are both useful in calculating distance from the reference point. In view of orientation, 3D images are best of all. Conclusion: Searching for fish bones and gathering information about them are difficult tasks in esophageal foreign body cases. Fish bone foreign body models and their reconstructed images are useful in getting information about size, shape, location, and orientation. This technique could be applied in finding real fish bone foreign bodies.

Accuracy of radiography, computed tomography and magnetic resonance imaging in diagnosing foreign bodies in the foot

The purpose of this study was to determine the accuracy of conventional radiography, computed tomography (CT) and magnetic resonance imaging (MRI) in detecting foreign bodies by using cadaver feet. One hundred and sixty foreign bodies consisting of 5 × 2-mm fresh wood, dry wood, glass, porcelain and plastic fragments were randomly placed in the plantar soft tissue of the forefoot and sole. An additional 160 incisions were made without the insertion of foreign bodies. Radiographs, CT and MRI scans were assessed in a blinded fashion for the presence of a foreign body. Overall sensitivity and specificity for foreign body detection was 29% and 100% for radiographs, 63% and 98% for CT and 58% and 100% for MRI. The sensitivity of radiography was lower in the forefoot. CT and MRI detection rates depended on the attenuation values of the foreign bodies and on the susceptibility artefact, respectively. CT was superior to MRI in identifying water-rich fresh wood. Radiography, CT and MRI are highly specific in detecting foreign bodies but sensitivity is poor. The detection rate depends on the type of foreign body for all techniques and on location for radiography. To identify foreign bodies with MRI, pulse sequences should be used to enhance the susceptibility artefact. In water-rich wood, as in chronically retained wood, CT is more accurate than MRI.

Case report and brief review of literature on sonographic detection of accidentally implanted wooden foreign body causing persistent sinus

Despite advances in imaging techniques, the detection of vegetative foreign bodies in soft tissues remains a difficult and sometimes even a challenging task. Clinical evaluation of such patient may present several months or even years after the initial injury and clinician may fail to elicit an antecedent skin puncture. X-ray examination will miss radiolucent foreign bodies. A 15-year-old boy presented with a draining non-healing sinus at the lateral aspect of his right thigh for 9 months. Musculoskeletal ultrasonography was ordered after ruling out chronic osteomyelitis to detect possible lesions around the thigh. High-frequency linear ultrasonic probe readily detected an elongated foreign body within the vastus lateralis muscle. A long piece of wood was confirmed at surgery. Non-healing sinus with normal finding in radiograph following old trauma should raise the suspicion of implanted radiolucent foreign body/bodies. The role of diagnostic ultrasound as a valuable screening tool for the detection of foreign body is briefly reviewed.

Inadvertent Ingestion of Wire Bristles From a Grill Cleaning Brush: Radiologic Detection of Unsuspected Foreign Bodies

We report acute onset of either odynophagia or abdominal pain immediately after ingestion of grilled meat in six patients presenting between May 1, 2009, and November 18, 2010. In all six patients, radiologic studies revealed a linear metallic foreign body. Careful history revealed cleaning of the grill with a metallic brush immediately before cooking in all six cases. Physicians should be aware of this potential hazard to facilitate accurate and timely diagnosis.

A Review of Full-Body Radiography in Nontraumatic Emergency Medicine

This paper reports on the application of full-body radiography to nontraumatic emergency situations. The Lodox Statscan is an X-ray machine capable of imaging the entire body in 13 seconds using linear slit scanning radiography (LSSR). Nontraumatic emergency applications in ventriculoperitoneal (VP) shunt visualisation, emergency room arteriography (ERA), detection of foreign bodies, and paediatric emergency imaging are presented. Reports show that the fast, full-body, and low-dose scanning capabilities of the Lodox system make it well suited to these applications, with the same or better image quality, faster processing times, and lower dose to patients. In particular, the large format scans allowing visualisation of a greater area of anatomy make it well suited to VP shunt monitoring, ERA, and the detection of foreign bodies. Whilst more studies are required, it can be concluded that the Lodox Statscan has the potential for widespread use in these and other nontraumatic emergency radiology applications.

Detection of Foreign Bodies in Foods Using Continuous Wave Terahertz Imaging

Foreign bodies (FBs) in food are health hazards and quality issues for many food manufacturers and enforcement authorities. In this study, continuous wave (CW) terahertz (THz) imaging at 0.2 THz with an output power of 10 mW was compared with X-ray imaging as techniques for inspection of food for FBs. High-density FBs, i.e., aluminum and granite pieces of various sizes, were embedded in a powdered instant noodle product and detected using THz and X-ray imaging. All aluminum and granite pieces (regular hexahedrons with an edge length of 1 to 5 mm) were visualized by both CW THz and X-ray imaging. THz imaging also detected maggots (length = 8 to 22 mm) and crickets (length = 35 and 50 mm), which were embedded in samples as low density FBs. However, not all sizes of maggot pieces embedded in powdered instant noodle were detected with X-ray imaging, although larger crickets (length = 50 mm and thickness = 10 mm) were detected. These results suggest that CW THz imaging has potential for detecting both high-density and low-density FBs embedded in food.

Ultraschallphänomene von Fremdkörpern der Kopf-, Halsweichteile. Vergleich von Kasuistik und Phantom

High resolution ultrasound is an accepted method in identification and classification of various head and neck alterations. Foreign bodies are a seldom encountered entity and are supposed to have a characteristic echogenicity. In literature there are numerous publications describing diagnosing foreign bodies in other specialities like gynaecology or surgery with ultrasound. The aim of the study was to examine these findings and to reproduce them in the head and neck area. The study includes the retrospective analysis of 6 cases. 3 cases have been reconstructed in a cadaver dissection model and a selfmade gel model. The findings were compared to the clinical cases and interpreted. In ultrasound foreign bodies have characteristic reflexions and artefacts. The diagnosis foreign body could be made in every case. The foreign body could not only be identified but also precisely localized. The findings were reproducable in both the cadaver and gel model. High resolution ultrasound is a dynamic, 3-dimentional, inexpensive, portable and readily available imaging method, facilitating the identification of lesions in the superficial soft tissues. In the hands of an experienced operator ultrasound may be the first imaging modality to be used for detection of radiolucent foreign bodies in head and neck area.

Rare presentation of a wooden foreign body in the thigh.

Children are prone to injury with foreign bodies, partly due to their ebullient nature. They may not always give an accurate history, which can lead to delay in diagnosis and treatment. Primary care givers need to be vigilant in eliciting a history of foreign body injury in children. Radiologists should be aware that a neglected foreign body lying close to the bone in the distal femur can evoke a massive periosteal reaction, which can mimic a bone neoplasm. Although metallic foreign bodies are detected with ease on radiographs, detection of wooden foreign bodies remains a challenging task for both the radiologist and the care-giving physician. Wood foreign bodies may induce errors in diagnosis. The paper includes an analysis of the different radiographic methods currently available and their main features. This report would be of relevance to primary care physicians, those concerned with trauma care, and for radiologists who screen for these injuries.

Imaging diagnosis of gastrointestinal foreign bodies in dogs and cats: Part 2

Gastrointestinal foreign bodies are an important differential diagnosis for patients presented for vomiting, and radiography remains the main initial imaging modality in these cases. However, while the detection of radiopaque foreign bodies is usually easy, radiolucent foreign bodies are more difficult to identify. This is particularly true if the obstruction they cause is incomplete or very proximal in the gastrointestinal tract, or if a linear foreign body is present. In these cases, ultrasonography can be a very useful complementary imaging technique. This article describes common radiographic and ultrasonographic changes associated with gastrointestinal foreign bodies.

Late Migration of a Foreign Body in the Foot 5 Years After Initial Trauma

An 11-year-old boy presented to our emergency department because of the extrusion of a small piece of glass through the plantar skin, 5 years after the initial trauma. Another foreign body was identified on ultrasounds and removed surgically. Ultrasound is an accurate test for detection of foreign bodies and to assess potential complications. The treatment of all foreign bodies is surgical exploration and removal, except if the risks of attempting removal are higher than the potential damage of the foreign body in its existing location. Migrations of foreign bodies are not uncommon. Ultrasounds could help for localization and removal as an intraoperative procedure. In case of suspicion of a foreign body after trauma, complementary examinations are required.

Non-opaque soft tissue foreign body: sonographic findings

BackgroundSoft tissue foreign bodies are a common cause of orthopedic consultation in emergency departments. It is difficult to confirm their existence because conventional radiology only detects radio-opaque foreign bodies. Sonography can be a useful diagnostic method. The aim of this study is to evaluate diagnostic accuracy of sonography in detection and localization of non-opaque foreign bodies.MethodsWe evaluated 47 patients with suspected foreign body retention in soft tissues by 10 MHz linear array transducer. A single radiologist performed all examinations with 6 years' experience in musculoskeletal Sonography. We detected and localized the presence of the foreign body in the soft tissue as guidance for facilitating the surgery.ResultsWe detected soft tissue foreign body in 45 cases as hyperechoic foci. Posterior acoustic shadowing was seen in 36 cases and halo sign was seen in 5 cases due to abscess or granulation tissue formation. Surgery was performed in 39 patients and 44 foreign bodies were removed.ConclusionSonography is a useful modality in detection and localization of radiolucent foreign bodies in soft tissue which can avoid misdiagnosis during primary emergency evaluation.