Department of Comprehensive Dentistry, University of Texas Health Science Center, San Antonio, Texas, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2012 Nov;114(5):658-65. doi: 10.1016/j.oooo.2012.08.436.
The objectives were to determine whether the images obtained from different cone-beam computerized tomography (CBCT) field of view (FOV) sizes with varying scan time and kilovolt peak using the Picasso Master 3D machine (Vatech, Hwasung, South Korea) differ in contrast-to-noise ratio (CNR).
A phantom was used. Scans were acquired using the same voxel size, 2 scan times (15 and 24 seconds) for 3 different FOV sizes and 5 different kilovolt peaks. The contrast and CNR were calculated for each FOV.
The CNRs were similar for the 2 scan times for all 3 FOV sizes. The CNR was lower in the 20 × 19 cm FOV compared with the other 2 FOVs for both scan times.
The CNR does not vary significantly with increasing scan times for all FOV sizes. Smaller FOVs result in enhanced CNR and contrast.
本研究旨在通过使用 Picasso Master 3D 机（韩国华城的 Vatech 公司）获取不同锥形束 CT（CBCT）视野（FOV）大小、不同扫描时间和千伏峰值的图像，以确定其在对比噪声比（CNR）方面是否存在差异。
本研究采用了一个体模。使用相同的体素大小，分别对 3 种不同 FOV 大小和 5 种不同千伏峰值进行了 2 次扫描（15 秒和 24 秒），并对每个 FOV 进行了对比度和 CNR 的计算。
对于所有 3 种 FOV 大小，2 次扫描的 CNR 相似。对于这两种扫描时间，20×19cm 的 FOV 的 CNR 均低于其他两种 FOV。
对于所有 FOV 大小，随着扫描时间的增加，CNR 变化不大。较小的 FOV 会提高 CNR 和对比度。
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