Split-Bolus Portal Venous Phase Dual-Energy CT Urography: Protocol Design, Image Quality, and Dose Reduction

2015 ◽  
Vol 205 (5) ◽  
pp. W492-W501 ◽  
Author(s):  
Chiao-Yun Chen ◽  
Jui-Sheng Hsu ◽  
Twei-Shiun Jaw ◽  
Ming-Chen Paul Shih ◽  
Lo-Jeh Lee ◽  
...  
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Dual Energy ◽  
Protocol Design ◽  
Dual Energy Ct ◽  
Ct Urography ◽  
Portal Venous Phase ◽  
Venous Phase

Split-bolus CT-urography using dual-energy CT: Feasibility, image quality and dose reduction

2012 ◽  
Vol 81 (11) ◽  
pp. 3160-3165 ◽  
Author(s):  
Mitsuru Takeuchi ◽  
Tatsuya Kawai ◽  
Masato Ito ◽  
Masaki Ogawa ◽  
Kazuya Ohashi ◽  
...  
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Urography

Diagnostic Performance of Split-Bolus Portal Venous Phase Dual-Energy CT Urography in Patients With Hematuria

2016 ◽  
Vol 206 (5) ◽  
pp. 1013-1022 ◽  
Author(s):  
Chiao-Yun Chen ◽  
Tzu-Hsueh Tsai ◽  
Twei-Shiun Jaw ◽  
Ming-Lai Lai ◽  
Min-Fang Chao ◽  
...  
Keyword(s):  
Diagnostic Performance ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Urography ◽  
Portal Venous Phase ◽  
Venous Phase

scholarly journals Diagnostic accuracy of color-coded virtual noncalcium reconstructions derived from portal venous phase dual-energy CT in the assessment of lumbar disk herniation

2021 ◽  
Author(s):  
Vitali Koch ◽  
Moritz H. Albrecht ◽  
Leon D. Gruenewald ◽  
Ibrahim Yel ◽  
Katrin Eichler ◽  
...  
Keyword(s):  
Diagnostic Accuracy ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Disk Herniation ◽  
Lumbar Disk Herniation ◽  
Portal Venous Phase ◽  
Lumbar Disk ◽  
Contrast Enhanced ◽  
Dual Source ◽  
Venous Phase

Abstract Objectives To investigate the diagnostic accuracy of color-coded contrast-enhanced dual-energy CT virtual noncalcium (VNCa) reconstructions for the assessment of lumbar disk herniation compared to unenhanced VNCa imaging. Methods A total of 91 patients were retrospectively evaluated (65 years ± 16; 43 women) who had undergone third-generation dual-source dual-energy CT and 3.0-T MRI within an examination interval up to 3 weeks between November 2019 and December 2020. Eight weeks after assessing unenhanced color-coded VNCa reconstructions for the presence and degree of lumbar disk herniation, corresponding contrast-enhanced portal venous phase color-coded VNCa reconstructions were independently analyzed by the same five radiologists. MRI series were additionally analyzed by one highly experienced musculoskeletal radiologist and served as reference standard. Results MRI depicted 210 herniated lumbar disks in 91 patients. VNCa reconstructions derived from contrast-enhanced CT scans showed similar high overall sensitivity (93% vs 95%), specificity (94% vs 95%), and accuracy (94% vs 95%) for the assessment of lumbar disk herniation compared to unenhanced VNCa images (all p > .05). Interrater agreement in VNCa imaging was excellent for both, unenhanced and contrast-enhanced CT (κ = 0.84 vs κ = 0.86; p > .05). Moreover, ratings for diagnostic confidence, image quality, and noise differed not significantly between unenhanced and contrast-enhanced VNCa series (all p > .05). Conclusions Color-coded VNCa reconstructions derived from contrast-enhanced dual-energy CT yield similar diagnostic accuracy for the depiction of lumbar disk herniation compared to unenhanced VNCa imaging and therefore may improve opportunistic retrospective lumbar disk herniation assessment, particularly in case of staging CT examinations. Key Points • Color-coded dual-source dual-energy CT virtual noncalcium (VNCa) reconstructions derived from portal venous phase yield similar high diagnostic accuracy for the assessment of lumbar disk herniation compared to unenhanced VNCa CT series (94% vs 95%) with MRI serving as a standard of reference. • Diagnostic confidence, image quality, and noise levels differ not significantly between unenhanced and contrast-enhanced portal venous phase VNCa dual-energy CT series. • Dual-source dual-energy CT might have the potential to improve opportunistic retrospective lumbar disk herniation assessment in CT examinations performed for other indications through reconstruction of VNCa images.

Diagnostic performance of single-phase dual-energy CT to differentiate vascular and nonvascular incidental renal lesions on portal venous phase: comparison with CT

2021 ◽  
Author(s):  
Domenico Mastrodicasa ◽  
Martin J. Willemink ◽  
Nikhil Madhuripan ◽  
Ranjit Singh Chima ◽  
Amanzo A. Ho ◽  
...  
Keyword(s):  
Diagnostic Performance ◽  
Single Phase ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Portal Venous Phase ◽  
Renal Lesions ◽  
Venous Phase

Iodine dose optimization in portal venous phase virtual monochromatic images of the abdomen: Prospective study on rapid kVp switching dual energy CT

2020 ◽  
Vol 122 ◽  
pp. 108746 ◽  
Author(s):  
Yoshifumi Noda ◽  
Satoshi Goshima ◽  
Yuka Nakashima ◽  
Toshiharu Miyoshi ◽  
Nobuyuki Kawai ◽  
...  
Keyword(s):  
Prospective Study ◽  
Dual Energy ◽  
Dose Optimization ◽  
Dual Energy Ct ◽  
Portal Venous Phase ◽  
Venous Phase ◽  
Iodine Dose

Dual-Source Dual-Energy CT Portal Venous Phase Abdominal CT Scans in Large Body Habitus Patients

2018 ◽  
Vol 42 (6) ◽  
pp. 932-936 ◽  
Author(s):  
Vinit Baliyan ◽  
Hamed Kordbacheh ◽  
Jessica Serrao ◽  
Dushyant V. Sahani ◽  
Avinash R. Kambadakone
Keyword(s):  
Large Body ◽  
Dual Energy ◽  
Ct Scans ◽  
Dual Energy Ct ◽  
Abdominal Ct ◽  
Body Habitus ◽  
Portal Venous Phase ◽  
Dual Source ◽  
Venous Phase

Side-by-side evaluation of virtual non-contrast and post-contrast images improves detection of clinically significant urolithiasis on single-phase split bolus dual-energy CT urography

2021 ◽  
Vol 94 (1121) ◽  
pp. 20210013
Author(s):  
Doris Dodig ◽  
Tereza Solocki Matić ◽  
Iva Žuža ◽  
Ivan Pavlović ◽  
Damir Miletić ◽  
...  
Keyword(s):  
Dose Reduction ◽  
Single Phase ◽  
Dual Energy ◽  
Detection Sensitivity ◽  
Urinary Stones ◽  
Dual Energy Ct ◽  
Ct Urography ◽  
Post Contrast ◽  
Clinically Significant ◽  
Stone Detection

Objectives: Studies show insufficient sensitivity of virtual non-contrast (VNC) reconstructions for stone detection in dual-energy CT urography (DE-CTU). The aim of this study was to investigate if side-by-side-evaluation of both VNC and post-contrast images could increase the sensitivity of single-phase split bolus DE-CTU. Methods: Consecutive patients with haematuria who underwent split bolus DE-CTU on the same dual-source DE-CT scanner were retrospectively enrolled in the study. Intravenous furosemide and oral hydration were employed. Two readers, independently and then jointly in two separate sessions, recorded the location and the longest axial stone diameter on three randomised sets of images: separate VNC and post-contrast images, and side-by-side-reconstructions. True non-contrast (TNC) images served as the standard of reference. Results: A total of 83 urinary stones were detected on TNC images. Independent reader side-by-side-evaluation of VNC and post-contrast images yielded higher stone detection sensitivity (76 and 84%, respectively) compared to evaluation of only VNC (71 and 81%, respectively) or post-contrast images (64 and 80%, respectively). The sensitivity of joint reader evaluation of side-by-side-images reached almost 86% and was not significantly different from TNC images (p = 0.77). All stones larger than 3 mm were correctly detected by side-by-side-evaluation. Dose reduction of 55% could be achieved by omitting TNC scans. Conclusion: Side-by-side-VNC and post-contrast image evaluation enable detection of clinically significant urolithiasis on single-phase split bolus DE-CTU with significant dose reduction. Advances in knowledge: This study shows that single-phase DE-CTU is feasible if VNC imaging is simultaneously utilised with post-contrast images.

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