Optimal scan timing for artery-vein separation at whole-brain CT angiography using a 320-row MDCT volume scanner

Takashi Shirasaka, Akio Hiwatashi, Koji Yamashita, Masatoshi Kondo, Hiroshi Hamasaki, Yamato Shimomiya, Yasuhiko Nakamura, Yoshinori Funama, Hiroshi Honda

Research output: Contribution to journalArticle

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Abstract

Objective: A 320-row multidetector CT (MDCT) is expected for a good artery-vein separation in terms of temporal resolution. However, a shortened scan duration may lead to insufficient vascular enhancement. We assessed the optimal scan timing for the artery-vein separation at whole-brain CT angiography (CTA) when bolus tracking was used at 320- row MDCT. Methods: We analyzed 60 patients, who underwent whole-brain four-dimensional CTA. Difference in CT attenuation between the internal carotid artery (ICA) and the superior sagittal sinus (Datt) was calculated in each phase. Using a visual evaluation score for the depiction of arteries and veins, we calculated the difference between the mean score for the intracranial arteries and the mean score for the veins (Dscore). We assessed the time at which the maximum Datt and Dscore were simultaneously observed. Results: The maximum Datt was observed at 6.0 s and 8.0s in the arterial-dominant phase and at 16.0 s and 18.0 s in the venous-dominant phase after the contrast media arrival time at the ICA (Taa). The maximum Dscore was observed at 6.0s and 8.0s in the arterial-dominant phase and at 16.0s in the venous-dominant phase after the Taa. There were no statistically significant differences in Datt (p50.375) or Dscore (p50.139) between these scan timings. Conclusion: The optimal scan timing for artery-vein separation at whole-brain CTA was 6.0 s or 8.0 s for the arteries and 16.0 s for the veins after the Taa. Advances in knowledge: Optimal scan timing allowed us to visualize intracranial arteries or veins with minimal superimposition.

Original languageEnglish
Article number20160634
JournalBritish Journal of Radiology
Volume90
Issue number1070
DOIs
Publication statusPublished - Jan 1 2017

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Cone-Beam Computed Tomography
Veins
Arteries
Brain
Internal Carotid Artery
Four-Dimensional Computed Tomography
Superior Sagittal Sinus
Computed Tomography Angiography
Contrast Media
Blood Vessels

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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Optimal scan timing for artery-vein separation at whole-brain CT angiography using a 320-row MDCT volume scanner. / Shirasaka, Takashi; Hiwatashi, Akio; Yamashita, Koji; Kondo, Masatoshi; Hamasaki, Hiroshi; Shimomiya, Yamato; Nakamura, Yasuhiko; Funama, Yoshinori; Honda, Hiroshi.

In: British Journal of Radiology, Vol. 90, No. 1070, 20160634, 01.01.2017.

Research output: Contribution to journalArticle

Shirasaka, T, Hiwatashi, A, Yamashita, K, Kondo, M, Hamasaki, H, Shimomiya, Y, Nakamura, Y, Funama, Y & Honda, H 2017, 'Optimal scan timing for artery-vein separation at whole-brain CT angiography using a 320-row MDCT volume scanner', British Journal of Radiology, vol. 90, no. 1070, 20160634. https://doi.org/10.1259/bjr.20160634
Shirasaka, Takashi ; Hiwatashi, Akio ; Yamashita, Koji ; Kondo, Masatoshi ; Hamasaki, Hiroshi ; Shimomiya, Yamato ; Nakamura, Yasuhiko ; Funama, Yoshinori ; Honda, Hiroshi. / Optimal scan timing for artery-vein separation at whole-brain CT angiography using a 320-row MDCT volume scanner. In: British Journal of Radiology. 2017 ; Vol. 90, No. 1070.
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AU - Shirasaka, Takashi

AU - Hiwatashi, Akio

AU - Yamashita, Koji

AU - Kondo, Masatoshi

AU - Hamasaki, Hiroshi

AU - Shimomiya, Yamato

AU - Nakamura, Yasuhiko

AU - Funama, Yoshinori

AU - Honda, Hiroshi

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AB - Objective: A 320-row multidetector CT (MDCT) is expected for a good artery-vein separation in terms of temporal resolution. However, a shortened scan duration may lead to insufficient vascular enhancement. We assessed the optimal scan timing for the artery-vein separation at whole-brain CT angiography (CTA) when bolus tracking was used at 320- row MDCT. Methods: We analyzed 60 patients, who underwent whole-brain four-dimensional CTA. Difference in CT attenuation between the internal carotid artery (ICA) and the superior sagittal sinus (Datt) was calculated in each phase. Using a visual evaluation score for the depiction of arteries and veins, we calculated the difference between the mean score for the intracranial arteries and the mean score for the veins (Dscore). We assessed the time at which the maximum Datt and Dscore were simultaneously observed. Results: The maximum Datt was observed at 6.0 s and 8.0s in the arterial-dominant phase and at 16.0 s and 18.0 s in the venous-dominant phase after the contrast media arrival time at the ICA (Taa). The maximum Dscore was observed at 6.0s and 8.0s in the arterial-dominant phase and at 16.0s in the venous-dominant phase after the Taa. There were no statistically significant differences in Datt (p50.375) or Dscore (p50.139) between these scan timings. Conclusion: The optimal scan timing for artery-vein separation at whole-brain CTA was 6.0 s or 8.0 s for the arteries and 16.0 s for the veins after the Taa. Advances in knowledge: Optimal scan timing allowed us to visualize intracranial arteries or veins with minimal superimposition.

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