Nihon Hoshasen Gijutsu Gakkai zasshi · 2016
[The Advantage of 80-row Non-helical Scan Method for Head Computed Tomography: In Basal Ganglia and Parietal].
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Fukunaga Masaaki, Onishi Hideo, Yamamoto Hiroyuki
Аннотация
PURPOSE: The purpose of this study was to evaluate the advantage of 80-row non-helical scan methods (NH) for the head computed tomography (CT).
METHODS: We calculated the noise power spectrum (NPS), contrast-to-noise ratio (CNR), CT values and standard deviation (SD) at slice position, and coefficient of variation (CV) value in head phantom. This study compared the NH method with the helical scan method (HE).
RESULTS: The NPS and CNR of NH were improved compared to the HE in equivalent volume-CT dose index (CTDIvol). However, the NH was inferior to the HE in CT values and the SD at slice position. The CV values of NH were increased than the HE in the skull base. On the other hand, the CV values of NH were decreased than the HE in basal ganglia and parietal.
CONCLUSIONS: The non-helical scan method in head CT have advantage for the detection of lesion in basal ganglia and parietal.
METHODS: We calculated the noise power spectrum (NPS), contrast-to-noise ratio (CNR), CT values and standard deviation (SD) at slice position, and coefficient of variation (CV) value in head phantom. This study compared the NH method with the helical scan method (HE).
RESULTS: The NPS and CNR of NH were improved compared to the HE in equivalent volume-CT dose index (CTDIvol). However, the NH was inferior to the HE in CT values and the SD at slice position. The CV values of NH were increased than the HE in the skull base. On the other hand, the CV values of NH were decreased than the HE in basal ganglia and parietal.
CONCLUSIONS: The non-helical scan method in head CT have advantage for the detection of lesion in basal ganglia and parietal.