Virtual colonoscopy: Technical guide to avoid traps and pitfalls

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• 作者：Mahmoud Agha<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>dr.mahmoudagha@gmail.com" class="auth_mail" title="E-mail the corresponding authorsup><sup> ; sup><sup>mahmoudagha23@hotmail.com" class="auth_mail" title="E-mail the corresponding authorsup> ; Hanan Mansy<sup>csup><sup> ; sup><sup>bsup> ; Hazem Abd Ellatif<sup>dsup>
• 关键词：AGH ; Al-Mana General Hospital ; CO2 ; carbon dioxide ; C-RADS ; CT Colonography Reporting and Data System ; CT ; computed tomography ; MSCT ; Multislice CT scan ; ROI ; Region of interest ; SSD ; shaded-surface-display ; VC ; virtual colonoscopy ; 2D ; two dimensions ; 3D ; three dimensions
• 刊名：The Egyptian Journal of Radiology and Nuclear Medicine
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：47
• 期：1
• 页码：17-31
• 全文大小：5210 K

文摘

The study aims to clarify the ideal technique of virtual colonoscopy and how to avoid pitfalls.

sSec_2">Patient and methods

sp0010">200 patients were referred for VC screening.

sSec_3">Results

sp0015">3D VC false positive results were as follows: Pseudopolyps due to fecal residue (17.5%), under-distended colon (2%), segmental spasm (1%), respiratory motion artifacts (3%), prominent colonic haustrations (8.5%), prominent ileocecal valve (4.5%), prominent appendicular stump (0.5%) and false pits due to shine-through (1.5%). 3D false negative results were proved secondary to fecal residue (1.5%), retained fluid (2.5%), colonic under-distention (5%), prominent colonic folds (1%) and sessile polyps (1%).

sSec_4">2D navigation

sp0020">There were no false positive results. 3.5% false negative results were due to different combinations of fecal residue (3%), fluid (2%), under-distended colon (1%), prominent colonic haustrations (2.5%) and sessile polyps (1%). Finally, true positive results were proven in 40% of 3D and 47.5% of 2D navigations, true negative: 29.5% in 3D and 49% 2D. False positive results were proven in 19.5% of 3D, false negative results: 11% 3D and 3.5% 2D. 3D 78.4%, 2D 93% sensitivity and 3D 60.2% & 2D 100% specificity records.

sSec_5">Conclusion

sp0025">Many overestimating or underestimating VC pitfalls could be avoided, through mastering the technique and being more familiar with different navigation methods and these technical pitfalls.