Dose and Image Quality Evaluation of a Dedicated Cone-Beam CT System for High-Contrast Neurologic Applications

被引:45
作者
Yu, Lifeng [1 ]
Vrieze, Thomas J. [1 ]
Bruesewitz, Michael R. [1 ]
Kofler, James M. [1 ]
DeLone, David R. [1 ]
Pallanch, John F. [2 ]
Lindell, E. Paul [1 ]
McCollough, Cynthia H. [1 ]
机构
[1] Mayo Clin, Dept Radiol, Rochester, MN 55905 USA
[2] Mayo Clin, Dept Otorhinolaryngol, Rochester, MN 55905 USA
关键词
cone-beam CT (CBCT); CT dosimetry; image quality; FLAT-PANEL IMAGER; COMPUTED-TOMOGRAPHY; ARM; DOSIMETRY; DETECTOR; SURGERY; GUIDANCE; SCANNER; CTDI100; MOBILE;
D O I
10.2214/AJR.09.2951
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
OBJECTIVE. The purpose of our study was to evaluate the dose and image quality performance of a dedicated cone-beam CT (CBCT) scanner in comparison with an MDCT scanner. MATERIALS AND METHODS. The conventional dose metric, CT dose index (CTDI), is no longer applicable to CBCT scanners. We propose to use two dose metrics, the volume average dose and the mid plane average dose, to quantify the dose performance in a circular cone-beam scan. Under the condition of equal mid plane average dose, we evaluated the image quality of a CBCT scanner and an MDCT scanner, including high-contrast spatial resolution, low-contrast spatial resolution, noise level, CT number uniformity, and CT number accuracy. RESULTS. For the sinus scanning protocol, the CBCT system had comparable high-contrast resolution and inferior low-contrast resolution to those obtained with the MDCT scanner when the doses were matched (mid plane average dose 9.2 mGy). The CT number uniformity and accuracy were worse on the CBCT scanner. The image artifacts caused by beam hardening and scattering were also much more severe on the CBCT system. CONCLUSION. With a matched radiation dose, the CBCT system for sinus study has comparable high-contrast resolution and inferior low-contrast resolution relative to the MDCT scanner. Because of the more severe image artifacts on the CBCT system due to the small field of view and the lack of accurate scatter and beam-hardening correction, the utility of the CBCT system for diagnostic tasks related to soft tissue should be carefully assessed.
引用
收藏
页码:W193 / W201
页数:9
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