Leander Peter, Söderberg Marcus, Fält Tobias, Gunnarsson Mikael, Albertsson Ida
Department of Radiology, Malmö University Hospital, Lund University, Malmö, Sweden.
Radiat Prot Dosimetry. 2010 Apr-May;139(1-3):180-5. doi: 10.1093/rpd/ncq086. Epub 2010 Mar 5.
The collective effective radiation dose to the population is increasing due to a higher use of computerised tomography. SharpView AB, Linköping, Sweden, has developed an adaptive non-linear post-processing image filtration that may enable the use of lower radiation doses. The present study assessed if a lower dose with image filtration had the same image quality as a higher dose without the filter applied. All imaging was performed on a Siemens Somatom Sensation 16 CT. The parameters used were 120 kV and 200 mAs (40 patients) and 130 mAs without and with image filtering (40 patients), respectively. All studies were quantitatively evaluated for noise and image quality was assessed by visual grading characteristics (VGC) analysis. After image filtration, the noise in the processed images was lowered and the image quality was improved as shown by the VGC analysis. However, images using the higher dose were still ranked as the best in five out of eight criteria as shown by the VGC analysis. Image filtration enhances CT images significantly and further studies will show if 130 mAs with image filtration may be sufficient for clinically general abdominal CT.
由于计算机断层扫描的使用增加，人群所接受的集体有效辐射剂量正在上升。瑞典林雪平的SharpView AB公司开发了一种自适应非线性后处理图像过滤技术，这可能使较低辐射剂量的使用成为可能。本研究评估了采用图像过滤的较低剂量是否与未应用过滤器的较高剂量具有相同的图像质量。所有成像均在西门子Somatom Sensation 16 CT上进行。所使用的参数分别为120 kV和200 mAs（40例患者）以及未进行图像过滤和进行图像过滤时的130 mAs（40例患者）。所有研究均对噪声进行了定量评估，并通过视觉分级特征（VGC）分析对图像质量进行了评估。图像过滤后，处理后图像中的噪声降低，VGC分析显示图像质量得到改善。然而，VGC分析表明，在八项标准中的五项中，使用较高剂量的图像仍被评为最佳。图像过滤显著增强了CT图像，进一步的研究将表明130 mAs的图像过滤剂量对于临床常规腹部CT是否足够。
