Three-dimensional Virtual Dissection at CT Colonography: Unraveling the Colon to Search for Lesions

Silva, Alvin C.; Wellnitz, Clinton V.; Hara, Amy K.

doi:10.1148/rg.266055199

Cited by 40 publications

(15 citation statements)

References 22 publications

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“…With the growing use of CT colonography, accurate and time-efficient interpretation strategies are needed to accommodate the expected increase in the number of examinations performed with this technique [19]. Therefore, several new 3D projections have been created to enable a single unidirectional evaluation strategy by increasing surface visibility per time unit.…”

Section: Discussionmentioning

confidence: 99%

“…Advanced developments include virtual dissection, filet views, band views, as well as unfolded cube projections and the panoramic view [6,7,9,19,23]. Initial results from some advanced 3D displays, tested in a smaller series of patients, showed a reduced reading time without a significant difference in diagnostic accuracy compared with conventional 3D or 2D views [6,7,24,25].…”

Section: Discussionmentioning

confidence: 99%

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Comparison of diagnostic accuracy and interpretation times for a standard and an advanced 3D visualisation technique in CT colonography

et al. 2010

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Objective To compare the diagnostic accuracy of a standard bi-directional, three-dimensional (3D) CT colonography (CTC) fly-through (standard view, SV) with a unidirectional, 3D unfolding technique (panoramic view, PV). Methods 150 consecutive endoscopically-validated CTC patient datasets were retrospectively reviewed twice by two expert radiologists: first, with bidirectional SV, second, after 6-15 months, with unidirectional PV. Per-polyp sensitivities, percentage of visualised colonic mucosa, and reading times were calculated for both 3D visualisations. Results were tested for statistical significance by equivalence analysis for paired proportions and Student's paired t-test. Results In 81 patients, 236 polyps (101 adenomas, 135 nonadenomas) were detected. Sensitivities for polyps ≤5 mm, 6-9 mm and ≥10 mm were 60.1% (113/188), 92.9% (26/28) and 95.0% (19/20) with bidirectional SV, and 60.6% (114/ 188), 96.4% (27/28) and 95.0% (19/20) with unidirectional PV. Overall sensitivity for adenomas was 86.1% and 84.2% for SV and PV. Both methods provided equivalent polyp detection, with an equivalence limit set at 5%. PV and SV visualised 98.9 ± 1.1% (97.0-99.9%) and 96.2 ± 2.3% (91.4-98.8%) of the colonic mucosa (p>0.05). Mean interpretation time decreased from 14.6±2.5 (9.2-22.8) minutes with SV to 7.5 ± 3.2 (5.0-14.4) using PV (p<0.0001). Conclusion 3D CTC interpretation using unidirectional PV is equally as accurate, but significantly faster than an interpretation based on bidirectional SV.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Comparison of diagnostic accuracy and interpretation times for a standard and an advanced 3D visualisation technique in CT colonography

et al. 2010

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“…Recent advances in 3D visualization have resulted in new 3D tools, such as virtual dissection, panoramic views, unfolded, cube projections and translucency rendering [61][62][63][64] . These have been designed with an idea to reduce time (eliminating need for bidirectional study as in virtual dissection) and increase specificity by assigning different colors for tissues of different attenuations such as feces and polyps (Translucency rendering).…”

Section: Data Interpretationmentioning

confidence: 99%

Virtual colonoscopy: Utility, impact and overview

Ganeshan¹

2013

WJR

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Computed tomography (CT) colonoscopy is a well-established technique for evaluation of colorectal cancer. Significant advances have been made in the technique of CT colonoscopy since its inception. Excellent results can be achieved in detecting both colorectal cancer and significant sized polyps as long as a meticulous technique is adopted while performing CT colonoscopy. Furthermore, it is important to realize that there is a learning curve involved in interpreting these studies and adequate experience is essential to achieve high sensitivity and specificity with this technique. Indications, contraindications, technique and interpretation, including potential pitfalls in CT colonoscopy imaging, are reviewed in this article. Recent advances and the current role of CT colonoscopy in colorectal cancer screening are also discussed.

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“…These techniques display the entire 360°colonic inner circumference as if the colon had been opened with a longitudinal dissection [3,13,14]. However, current panoramic endoluminal display techniques produce variable degrees of image distortion, which potentially interferes with lesion detection [3,12,15].…”

mentioning

confidence: 99%

Panoramic endoluminal display with minimal image distortion using circumferential radial ray-casting for primary three-dimensional interpretation of CT colonography

Lee

Park

Kim³

et al. 2009

Eur Radiol

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The purpose of this study was to develop a panoramic endoluminal display technique, the band view, which causes minimal image distortion, and to determine its feasibility as a time-efficient primary three-dimensional review method of CT colonography (CTC). Image distortion was compared between the band view and four other three-dimensional review modes using ten 10-mm and ten 20-mm electronically generated polyps. Diagnostic performance and interpretation time were compared between the band view and the conventional endoluminal view by two independent readers in 52 patients who underwent CTC and colonoscopy on the same day. Mean image distortion index values, in which 1 indicates no distortion and the larger value represents greater distortion, were significantly smaller with the band view (1.03 and 1.01 for 10-mm and 20-mm polyps, respectively) than with the filet view (1.65 and 1.55) or the virtual colon dissection (3.27 and 3.85) (P < or = 0.004). The sensitivity and specificity for detecting adenomatous polyps > or = 6 mm did not differ, but the mean interpretation time was significantly shorter with the band view than with the conventional endoluminal view by 1.8 and 4.5 minutes in readers 1 and 2, respectively (P < 0.0001). The band view can be a time-efficient alternative for primary three-dimensional review of CTC.

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Three-dimensional Virtual Dissection at CT Colonography: Unraveling the Colon to Search for Lesions

Cited by 40 publications

References 22 publications

Comparison of diagnostic accuracy and interpretation times for a standard and an advanced 3D visualisation technique in CT colonography

Comparison of diagnostic accuracy and interpretation times for a standard and an advanced 3D visualisation technique in CT colonography

Virtual colonoscopy: Utility, impact and overview

Panoramic endoluminal display with minimal image distortion using circumferential radial ray-casting for primary three-dimensional interpretation of CT colonography

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