title: Diagnostic potential of virtual cystoscopy of the bladder: MRI vs CT. Preliminary report.
abstract: The aim of the study was to evaluate the diagnostic potential of the half-Fourier acquired single-shot turbo spin echo (HASTE) sequence for MRI cystoscopy compared with CT cystoscopy and the gold standard conventional cystoscopy. The MRI- and CT cystoscopy was performed in 29 patients with bladder tumors documented at cystoscopy and a control group using a 1.5-T unit (6-mm slice thickness) and a helical CT (3-mm collimation, pitch 1) after filling the bladder with air. Axial MRI and CT images were transferred to a workstation for application of virtual cystoscopy and compared with routine cystoscopy. Axial images and virtual cystoscopies were read by three readers for size and location of tumors. Forty-seven tumors were diagnosed at cystoscopy (12<1 cm, 35>/=1 cm). The sensitivity for detection of tumors smaller than 1 cm was 88.9% at MRI cystoscopy and 100% for tumors of 1 cm or larger. These results were not statistically different from the other modalities. Three tumors smaller than 1 cm were not detected at CT cystoscopy, four not all identical at MRI cystoscopy. One tumor with a wall thickening was detected on axial CT and MR images and CT cystoscopy by all observers, but only by two at MRI cystoscopy. The MRI cystoscopy is a diagnostic modality with results comparable to conventional and CT cystoscopy.
authors.affiliation: Department of Diagnostic Radiology, University Hospital, Otto-von-Guericke-University, Leipziger Strasse 44, 39120 Magdeburg, Germany. bernhart@uni-muenster.de
authors.forename: T M
authors.initials: TM
authors.lastname: Bernhardt
authors.forename: H
authors.initials: H
authors.lastname: Schmidl
authors.forename: C
authors.initials: C
authors.lastname: Philipp
authors.forename: E P
authors.initials: EP
authors.lastname: Allhoff
authors.forename: U
authors.initials: U
authors.lastname: Rapp-Bernhardt
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003558:Cystoscopy; D005260:Female; D006801:Humans; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011029:Pneumoradiography; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed; D001743:Urinary Bladder / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000175:diagnosis* / Q000473:pathology; D014584:User-Computer Interface