Application Of Three-dimensional Reconstruction Technique Research Articles

Three-dimensional morphological study of the effect of false acetabulum on the femoral structure in Crowe type Ⅳ developmental dysplasia of the hip

To explore the effect of false acetabulum on the development and anatomical morphology of proximal femur in Crowe type Ⅳ developmental dysplasia of the hip (DDH), providing a theoretical basis for the development of femoral reconstruction strategy and prosthesis selection for total hip arthroplasty. The medical records of 47 patients (54 hips) with Crowe type Ⅳ DDH between February 2008 and March 2020 were retrospectively analyzed, of which 21 patients (26 hips) were Crowe type Ⅳa (type Ⅳa group) and 26 patients (28 hips) were Crowe type Ⅳb (type Ⅳb group). There was no significant difference in general data such as gender, age, height, weight, body mass index, and side between the two groups ( P>0.05), which were comparable. The height of femoral head dislocation, the height of pelvis, and the proportion of dislocation were measured based on preoperative anteroposterior pelvic X-ray film. Based on the preoperative femoral CT scan data, the anatomical parameters of the femur and femoral medullary cavity were measured after three-dimensional reconstruction using Mimics19.0 software to calculate the canal fare index; and the femoral medullary cavity parameters were matched with the modular S-ROM prosthesis parameters. The results of X-ray film measurement showed that the height of femoral head dislocation and the proportion of dislocation in type Ⅳa group were significantly higher than those in type Ⅳb group ( P<0.05). There was no significant difference in the height of pelvis between the two groups ( P>0.05). The results of CT three-dimensional reconstruction measurements showed that compared with the type Ⅳb group, the type Ⅳa group had less isthmus height, smaller femoral head, shorter femoral neck, narrower neck-shaft angle, increased anteversion angle, and higher greater trochanter, and the differences were significant ( P<0.05). There was no significant difference in the height of femoral head, femoral offset, and height difference between greater trochanter and femoral head between the two groups ( P>0.05). There was no significant difference in the mediolateral width (ML), anteroposterior width (AP), and diameter of the isthmus (Ci level) and the AP of the medullary cavity in the plane 40 mm distal to the most prominent point on the medial side of the lesser trochanter (C -40 level) ( P>0.05), and the size of medullary cavity was significantly smaller in type Ⅳa group than in type Ⅳb group at the other levels ( P<0.05). Compared with the type Ⅳb group, the difference between the outer diameter of the prosthetic sleeve and the diameter of the medullary cavity fitting circle in the plane where the center of femoral head rotation was located from the medial most prominent point of the lesser trochanter (C 0 level) in type Ⅳa group was smaller, and the proportion of negative values was greater ( P<0.05). The difference between the longest diameter of the prosthetic sleeve triangle and the ML of the medullary cavity in the plane 10 mm proximal to the most prominent point on the medial side of the lesser trochanter (C +10 level) in type Ⅳa group was smaller, and the proportion of negative values was greater ( P<0.05). False acetabulum has a significant impact on the morphology of the proximal femur and medullary cavity in patients with Crowe type Ⅳ DDH, and the application of three-dimensional reconstruction technique can accurately evaluate the femoral morphology and guide the selection of femoral prosthesis.

Clinical Application of Three-Dimensional Reconstruction Technique in Thoracoscopic Pneumonectomy

Objective. To investigate the clinical value of 3D computed tomography bronchoangiography (3D CTBA) in thoracoscopic anatomical lung segment resection or combined lung segment resection. Methods. The clinical data of 25 patients with non-small-cell lung cancer who underwent thoracoscopic radical lobectomy and pulmonary segmentectomy with pulmonary nodules were retrospectively analyzed. All patients underwent preoperative thin-slice CT scan, and the bronchus, pulmonary artery, and pulmonary vein were reconstructed by DeepInsight software. Meanwhile, pulmonary nodules, tumors, or enlarged lymph nodes were reconstructed. Accurate preoperative planning was carried out through preoperative reconstruction of three-dimensional images, especially the variation of pulmonary bronchus and blood vessels, the relationship between tumors and enlarged lymph nodes and pulmonary blood vessels, and the precise positioning of pulmonary nodules in pulmonary segments. Compared with preoperative three-dimensional reconstruction, intraoperative real-time navigation can achieve accurate operation. The intraoperative conversion to thoracotomy, operative time, intraoperative bleeding and postoperative hospitalization time, drainage tube removal time and total drainage volume, and the incidence of perioperative complications were recorded. Results. The anatomical structure and variation of bronchus and pulmonary vessels were clearly reconstructed in all patients, and the reconstruction of the relationship between central tumor and enlarged lymph nodes and blood vessels was satisfactory. The location of pulmonary nodules in pulmonary segments was clearly defined, and preoperative planning was performed accurately. All patients underwent real-time intraoperative navigation, and precise surgery was performed according to the preoperative planning. The operation was successfully completed without any transfer to thoracotomy or intraoperative accidental bleeding. The operative time was (147.60 ± 37.77) min, the intraoperative blood loss was (33.82 ± 22.17) mL, the postoperative hospital stay was (7.02 ± 1.78) d, drainage tube removal time was (4.68 ± 1.60) d, and postoperative total drainage volume was (221.00 ± 135.03) mL; there were no severe complications and no death during perioperative period. Conclusion. The application of three-dimensional reconstruction technique for preoperative evaluation and subsequent thoracoscopic pulmonary segmental resection can achieve accurate, safe, and effective pulmonary segmental resection, reduce the difficulty of thoracoscopic pulmonary segmental resection, reduce the risk of surgery, and improve the surgical effect.

Application of three-dimensional reconstruction technique of MSCT in examination of colonic tumours

Objective To discuss the clinical value of application of three-dimensional reconstruction technique of MSCT in examination of colonic tumours.Methods Thirty patients underwent scanning using helical CT and post-processing on the workstation.All CTC images were reconstructed using shaded surface display (SSD) on workstation.Perspestive images such as the ones from DCBE were generated via raysum.The images could clearly demonstrate the extent and detail of the disorder by adjusting the CT value threshold.These results and that of barium enema and colon endoscopy were compared.Results Thirty cases had completely clinical and pathological data.3D images could correctly reveal the macroscopic morphology of colon tract and location of lesions.The correctly diagnostic rate was 100％ by MSCT,while the diagnostic rate by CTVE and colon endoscopy was basicly identical.Conclusion With the utilization of multiple methods,3D reconstruction can effectively demonstrate colonic tumours,and can be applied routinely in examination of colonic tumours. Key words: Colonic tumours ; Tomography, X-ray computed ; Image processing, computer assisted

Application of three-dimensional reconstruction technique based on CT-MRI fusion in skull base surgery

To study the application of three-dimensional reconstruction technique based on CT-MRI fusion in skull base surgery. To acquire the thin layer CT scan and MRI scanned images, to achieve image registration, fusion, segmentation and 3D visualization by using self-preparation software, to operate, observe and measure models by using methods of endoscopic observation, volume rendering segmentation, automatically and manually measure. The center of the eye and foramen magnum in CT-MRI were used as point registration. Good coincidence of important anatomic landmarks were formed in the image fusion. The boundary of spotted graphical was clear and complete. The models showed a complete, continuous, smooth surface. Virtual endoscopy could display the inside three-dimensional structures of skull from nasal with fluent operations of rotation and transparency. The boundary of skull stump segmented after volume rendering segmentation was clear and smooth, and it could show bone signs and soft tissue models together. Cooperation of automatic measurement method [(32.007 ± 15.311) mm] and the manual measurement method [(30.240 ± 15.169) mm] for measuring the maximum diameters of the tumor model, the difference was significant (t = 8.409, P < 0.05). The method of selecting the center of the eye and foramen magnum in point matching is scientific, simple and easy to operate. The models reconstructed based on CT-MRI fusion images can accurately reflect the size of the soft tissue and be better measured through the automatic measurement. Reconstruction models can be observed through the way of virtual endoscopic within the nasal cavity or volume rendering segmentation from outside to inside to frustrate the relationship of skull structures. Three-dimensional reconstruction techniques based on CT-MRI fusion in skull base surgery can be used to plan surgical approach, to assess the risk of surgery and to achieve space measurements, and it laid the foundation for the three-dimensional navigation.

Application of three-dimensional reconstruction technique of 16 slice spiral CT in diagnosis of mechanical intestinal obstruction

目的 探讨16层螺旋CT三维重建对机械性肠梗阻的诊断价值.方法 回顾性分析38例经手术证实为机械性肠梗阻,且X线和16层螺旋CT检查资料齐全的病例,把X线、二维CT及三维CT所见与手术病理结果对照并进行对比分析.结果 三维CT诊断肠梗阻的准确率为100%,病因诊断正确率92%(35/38),包括肠肿瘤16例,肠粘连6例,肠套叠5例,肠扭转2例,腹外疝3例和肠石3例.结论 16层螺旋CT三维重建对机械性肠梗阻的显示、诊断及制定治疗方案具有重要的临床意义。