O. Honda et al., High-resolution CT using multidetector CT equipment: Evaluation of image quality in II cadaveric lungs and a phantom, AM J ROENTG, 177(4), 2001, pp. 875-879
Citations number
13
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
OBJECTIVE. The aim of this study was to evaluate the image quality and diag
nostic efficacy of multidetector high-resolution CT (HRCT) by comparing it
with single-detector HRCT and by comparing the noise and artifact of multid
etector HRCT images with a phantom.
SUBJECTS AND METHODS. Multidetector HRCT with six parameters and single-det
ector HRCT were performed on cadaveric lungs. The image. quality and diagno
stic efficacy of multidetector HRCT were evaluated in comparison with those
of single-detector HRCT. A phantom was scanned, and image artifact and noi
se were investigated.
RESULTS. The image quality of multidetector HRCT with axial 1.25 mm x 4i (f
our images per gantry rotation) mode was equal to that of single-detector H
RCT. The image quality of multidetector HRCT with other modes was worse tha
n that on single-detector HRCT. The diagnostic efficacy of multidetector HR
CT with high-quality mode (pitch, 3:1) and axial mode was equal to that of
single-detector HRCT. The diagnostic efficacy on multidetector HRCT with hi
gh-speed mode (pitch, 6:1) was worse than that on single-detector HRCT. In
the phantom study, images made in high-speed mode had strong artifacts. Noi
se in the axial mode was milder than that in high-speed mode but more sever
e than that in high-quality mode.
CONCLUSION. The image quality of axial HRCT with multidetector CT is equal
to that on single-detector HRCT. Axial HRCT with multidetector CT is approp
riate for evaluating subtle lung abnormalities, but high-speed mode is unsu
itable. Using the high-quality mode degrades image quality but is still wor
thwhile.