Lung Image Quality with 320-row Wide-volume CT Scans: The Effect of Prospective ECG-gating and Comparisons with 64-row Helical CT Scans

Tsuneo Yamashiro, Tetsuhiro Miyara, Masashi Takahashi, Ayano Kikuyama, Hisashi Kamiya, Hisanobu Koyama, Yoshiharu Ohno, Hiroshi Moriya, Mitsuru Matsuki, Yuko Tanaka, Satoshi Noma, Sadayuki Murayama

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Abstract

Rationales and Objectives: To evaluate the image quality of 320-row wide-volume (WV) computed tomography (CT) scans in comparison with 64-row helical scans for the lung. Materials and Methods: The Institutional Review Board of each institution approved this prospective, multicenter study and informed consent was obtained. A total of 73 subjects underwent two types of chest CT, including 320-row WV scans and 64-row helical scans. Both scans used the same tube voltage, tube current, exposure time setting, and slice thickness. The helical scans were not electrocardiogram (ECG)-gated. For the WV scans, prospective ECG-gating was used for 38 subjects, whereas the other 35 subjects did not have ECG-gating. Using a 5-point scale from 1 (nondiagnostic) to 5 (excellent), three blinded observers independently evaluated image quality for five lobes and the lingula. The differences in the scores between WV scans and helical scans were compared using Wilcoxon's signed-rank test. Results: The WV scans with ECG-gating had significantly higher scores than 64-row helical scans for all lobes and lingula (right lower lobe, P <01; other lobes and lingula, P < .0001, respectively). The 320-row WV scans without ECG-gating also had significantly higher scores than 64-row helical scans (P < .05), except for nonsignificant differences for the left upper lobe. Conclusions: Lung image quality of ECG-gated WV scans, which do not require any additional radiation exposure, is better than that of non-ECG-gated 64-row helical scans. Non-ECG-gated 320-row WV scans are comparable or slightly superior to non-ECG-gated 64-row helical scans.

Original languageEnglish
Pages (from-to)380-388
Number of pages9
JournalAcademic Radiology
Volume19
Issue number4
DOIs
Publication statusPublished - 04-2012

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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    Yamashiro, T., Miyara, T., Takahashi, M., Kikuyama, A., Kamiya, H., Koyama, H., Ohno, Y., Moriya, H., Matsuki, M., Tanaka, Y., Noma, S., & Murayama, S. (2012). Lung Image Quality with 320-row Wide-volume CT Scans: The Effect of Prospective ECG-gating and Comparisons with 64-row Helical CT Scans. Academic Radiology, 19(4), 380-388. https://doi.org/10.1016/j.acra.2011.12.001