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

2012; Elsevier BV; Volume: 19; Issue: 4 Linguagem: Inglês

10.1016/j.acra.2011.12.001

1878-4046

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

Cardiac Imaging and Diagnostics

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. 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. 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. 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. 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.