Multi-detector CT in peritoneal carcinomatosis: diagnostic role of thin slices and multiplanar reconstructions

Background  In order to investigate whether 1-mm thin slices and multiplanar reconstructions (MPRs) of multi-detector computed tomography (CT) datasets interpreted in addition to isotropic 5-mm thick slices in one session improve the detection of peritoneal carcinomatosis. Methods  The abdominal CT datasets of 44 patients with histologically proven tumors of the abdomen or pelvis were retrospectively evaluated for peritoneal carcinomatosis by four radiologists with variable experience (radiologist 1: ≥10 years, radiologists 2 and 3: 1.5 years, radiologist 4: 0.5 years). In three successive steps, the radiologists evaluated first the axial 5-mm slices, second the 1-mm slices, and third the MPRs and rated their diagnostic confidence. Results  Specificity was nearly unchanged for all the four radiologists. Sensitivity improved for the most experienced and the least experienced radiologists and was unchanged for the two readers with intermediate skills. Except for the third step of radiologist 4, no statistically significant differences in diagnostic performance were detected. The diagnostic confidence of all the four readers benefited to variable degrees from interpretation of the 1-mm slices and MPRs. Conclusions  While 5-mm slices are sufficient for the detection of peritoneal carcinomatosis, 1-mm slices and MPRs can improve sensitivity and diagnostic confidence.     

Recurrent bladder tumors after transurethral resection: Diagnostic yield of MDCT-virtual cystoscopy

Purpose

To evaluate the diagnostic efficacy of computed tomography-virtual cystoscopy in the depiction of recurrent bladder tumors after transuretehral resection (TUR) and compare its results with those of standard invasive conventional cystoscopy.

Anatomical study of the occipital sinus using contrast-enhanced magnetic resonance venography

The frequency and anatomical features of the occipital sinus (OS) were analyzed in this study by contrast-enhanced magnetic resonance venography (MRV) with enhanced fast gradient echo three-dimensional (EFGRE3D) and we discuss the clinical usefulness of this method. The study included 555 patients who underwent contrast-enhanced MRV with EFGRE3D, and maximum intensity projection (MIP), multiplanar reformation (MPR) and multiprojection volume reconstruction (MPVR) images were obtained for the regions of interest. The frequency, size and communication of the OS with other vessels were assessed. The OS was identified in 209 of the 555 patients (37.7%). There were no statistically significant sex-related differences. The OS was observed less frequently in subjects younger than 50 years. Cranially and/or caudally, some OS were separated and communicated with multiple vessels. In five patients, the straight sinus (StS) communicated directly with the OS and not with the other sinuses; in two patients, the StS communicated with veins other than the OS only via small anastomotic veins. Many morphological differences in the OS can be seen. In addition, some OS function as the main drainage route of the intracranial veins instead of the transverse sinus or sigmoid sinus. In addition to MIP, detailed examination by MPR and MPVR is required for the preoperative evaluation of posterior cranial fossa lesions.     

螺旋CT多平面重组对眼部异物的诊断价值

目的探讨螺旋CT多平面重组在眼部异物定位诊断中的价值。方法经眼科手术证实的眼部异物12例（13眼）。采用螺旋CT进行眼眶轴位薄层扫描,并利用多平面重组（MPR）技术对异物进行三维定位分析。结果所有异物定位诊断与手术结果相符。结论CT多平面重组技术对眼部异物的三维定位有重要价值。     

Assessment of image quality of 64-row Dual Source versus Single Source CT coronary angiography on heart rate: a phantom study

The purpose of this study was to evaluate the agreement between axial, multiplanar reformatted (MPR) and semi-automated software measurements of pulmonary vein ostial diameters and distance to the first bifurcation. CT examinations of the thorax were retrospectively reviewed in 150 consecutive patients. The pulmonary vein ostial diameter and distance to the first bifurcation of the four main pulmonary veins were independently measured. The three measurement methods were compared using a Bland-Altman test. There was no significant variation between pulmonary vein ostial diameter measurements for the superior pulmonary veins across the three measurement methods. There was significant variation between the semi-automated program and both the axial (p = 0.001) and MPR (p < 0.001) measured diameters for the right inferior pulmonary vein ostial diameter and between the MPR and semi-automated program measurements (p = 0.02) for the left inferior pulmonary vein ostial diameter. There was no significant variation between the pulmonary vein distance to first bifurcation measurements for any pulmonary vein across the three measurement methods. However, from a clinical perspective, differences were negligible; therefore, the clinician may confidently use any of the three measurement methods presented.     

螺旋CT多平面重建技术临床应用价值

目的：探讨螺旋CT多平面重建技术在临床诊断中的价值。方法：对200例患者不同部位感性趣区进行螺旋CT扫描，随后进行多平面重建。结果：多平面重建技术能够多方位显示病变的比邻关系及范围。结论：恰当的选择多平面重建技术系列，有针对性的对病变进行观察，有助于全面理解和分析病灶的全貌，为临床提供更直观可靠的信息。     

MSCT扫描及MPR矢状位重建图像技术在胸腰椎压缩骨折患者影像学诊断的应用

目的探讨多层螺旋CT(MSCT)扫描及MPR矢状位重建图像技术在胸腰椎压缩骨折患者影像学诊断的应用价值。方法选取我院收治的胸腰椎压缩骨折患者96例为研究对象,均行X线、MSCT检查,比较两种方法诊断胸腰椎压缩骨折的灵敏度、特异度、准确度,并分析椎体骨折分布情况及不同类型胸腰椎压缩骨折的显示率,观察胸腰椎压缩骨折的MSCT影像特征。结果 96例患者骨折椎体114例,范围为T12-L5椎体,其中以T12-L1椎体最多(75.44%);MSCT诊断胸腰椎骨折的灵敏度75.00%、准确度73.96%明显高于X线检查60.00%、64.58%(P0.05),特异度比较无显著差异(P0.05);MPR重建中矢状位对胸腰椎压缩骨折的显示率90.91%较冠状位69.42%、横断面64.46%高(P0.05);MPR矢状位重建图像显示骨折整体,立体感强,能很好地显示椎管变形、椎管内碎骨片。结论 MSCT扫描及MPR矢状位重建图像技术对胸腰椎压缩骨折具有重要的诊断价值,值得在临床推广应用。     

螺旋CT三维重建用于正畸埋伏牙定位的临床研究

目的探讨螺旋CT三维重建用于正畸埋伏牙定位的临床效果。方法对10例埋伏牙患者作螺旋CT扫描,采用表面遮盖显示(SSD)、多平面重建(MPR)、最大密度投影法(MIP)获得牙体表面立体图像及任意平面、曲面的断层影像。结果螺旋CT三维重建能清晰显示埋伏牙的形态、唇腭向位置、萌出方向及与邻牙的关系。结论螺旋CT三维重建术可作为埋伏牙进行正畸治疗前的准确有效的检查手段。