ABSTRACT
<p><b>OBJECTIVE</b>To evaluate the feasibility of 3-Dimensional (3-D) model reconstruction of penis and surrounding structures based on magnetic resonance images, which may provide the model building method for modeling surgery of individual penoplasty.</p><p><b>METHODS</b>Magnetic resonance (MR) images of penis with different imaging parameters were evaluated. With the surface rendering construction, the 3D virtual model was established by Amira software.</p><p><b>RESULTS</b>The anatomical details imaging is better in T2-weighted fast spin-echo images with 3.0 mm slice thickness. The established model based on the MR images can show the soft-tissue, suspensory ligament of the penis. The suspensory ligament stretches between the pubic symphysis and the corpora cavernosa. The penile roots attach to inferior ramus of pubis.</p><p><b>CONCLUSIONS</b>MR imaging provides enough anatomical information for modeling. It can be used for the development of model surgery system of individual penoplasty.</p>
Subject(s)
Adult , Humans , Male , Imaging, Three-Dimensional , Magnetic Resonance Imaging , Models, Anatomic , PenisABSTRACT
OBJECTIVE: To record the MR imaging features of primary central nervous system lymphoma (PCNSL) and compare these features in monofocal and multifocal disease. MATERIALS AND METHODS: Twenty-one cases of monofocal disease were compared to five cases of multifocal disease. All patients were examined by non-enhanced and contrast-enhanced MRI. Tumor location, tumor size, signal intensity, enhancement characteristics, age distribution, peritumoral edema, cystic changes, and the presence of calcifications were assessed. The MRI features were compared between the monofocal and multifocal disease cases. RESULTS: The 26 cases, including both the monofocal and multifocal cases, exhibited 37 lesions. Contrast-enhanced images showed variable enhancement patterns: homogeneous enhancement (33 lesions), ring-like enhancement (2), and 'open-ring-like' enhancement (2). The 'notch sign' was noted in four of 33 homogeneously enhancing lesions. One case of hemorrhage and three cases of cystic formation were observed. Intra-tumoral calcification was not found. The frontal lobe, the corpus callosum and the basal ganglia were commonly affected in both the monofocal and multifocal groups. Tumor size differed significantly between the two groups (t = 3.129, p 0.05) and the signal characteristics (p > 0.05) between the two groups. CONCLUSION: Our data show that PCNSL has a variable enhancement pattern on MR images. We first reported two lesions with an 'open-ring' enhancement as well as four cases with a 'notch sign'. Monofocal PCNSL cases typically have larger sized tumors with mild or moderate enhancement.
Subject(s)
Adult , Aged , Female , Humans , Male , Middle Aged , Young Adult , Brain/pathology , Brain Neoplasms/pathology , Contrast Media , Gadolinium DTPA , Image Enhancement/methods , Immunocompetence , Lymphoma/pathology , Magnetic Resonance Imaging/methods , Observer Variation , Retrospective StudiesABSTRACT
Objective To evaluate the diagnostic value of MR I、CT、DSA for cerebral arteriovenous malformation(AVM). Methods A total of 40 case of AVM were examined with imaging methods in which 19 MRI, 30 CT and, 12 DSA. Combination of two or three kinds of eximinations were perfo rmed in 20 and 4, respectively. Results Diagnostic accordance r ate rate of CT was 70%, sensitivity and specificity of MRI were 100% and 84% res pectiv ely, diagnostic accordance rate of DSA was 92%. Conclusion MRI,CT,D SA can play important roles in the diagnosis of AVM. MR and DSA are superior to CT. DSA could reveal the circulation time and the stealing blood situation of AV M and thus suggests the applicability of interventional embolization therapy.
ABSTRACT
Objective To evaluate the diagnostic value of MR I、CT、DSA for cerebral arteriovenous malformation(AVM). Methods A total of 40 case of AVM were examined with imaging methods in which 19 MRI, 30 CT and, 12 DSA. Combination of two or three kinds of eximinations were perfo rmed in 20 and 4, respectively. Results Diagnostic accordance r ate rate of CT was 70%, sensitivity and specificity of MRI were 100% and 84% res pectiv ely, diagnostic accordance rate of DSA was 92%. Conclusion MRI,CT,D SA can play important roles in the diagnosis of AVM. MR and DSA are superior to CT. DSA could reveal the circulation time and the stealing blood situation of AV M and thus suggests the applicability of interventional embolization therapy.