Evaluation of an in-use chest CT protocol in lung cancer screening - A single institutional study

IF 0.9 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
S. Naimi, M. Tetteh, Haseem Ashraf, S. Johansen
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Abstract

Lung cancer is the most common cause of cancer-related death worldwide and therefore there has been a growing demand for low-dose computed tomography (LDCT) protocols. To investigate and evaluate the dose and image quality of patients undergoing lung cancer screening (LCS) using LDCT in Norway. Retrospective dosimetry data, volumetric CT dose index (CTDIvol) and dose-length product (DLP), from 70 average-size and 70 large-size patients who underwent LDCT scan for LCS were included in the survey. Effective dose and size-specific dose were calculated for each examination and were compared with the American Association of Physicists in Medicine (AAPM) requirement. For a quantitative image quality analysis, noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) were determined for different regions in the chest with two iterative reconstruction techniques, iDose and Iterative Model Reconstruction. Differences in dose and image quality between average-size and large-size patients were evaluated by Independent sample t test, and Wilcoxon signed rank test within the same patient group. The independent sample t test revealed significant differences ( p < .05) in dose values between average-size and large-size patients. Mean CTDIvol and DLP for average-size patients were 2.8 mGy and 115 mGy.cm, respectively, with appropriate increment for the large-size patients. Image quality (image noise, SNR, and CNR) did not significantly differ between patient groups when images were reconstructed with a model based iterative reconstruction algorithm. The screening protocol assessed in this study resulted in CTDIvol values that were compliant with AAPM recommendation. No significant differences in objective image quality were found between patient groups.
评估肺癌筛查中使用中的胸部 CT 方案 - 一项单一机构研究
肺癌是全球最常见的癌症致死原因,因此对低剂量计算机断层扫描(LDCT)方案的需求日益增长。调查和评估在挪威使用 LDCT 进行肺癌筛查(LCS)的患者的剂量和图像质量。调查包括70名接受低剂量计算机断层扫描(LDCT)进行肺癌筛查的普通体型和大体型患者的回顾性剂量测量数据、容积计算机断层扫描剂量指数(CTDIvol)和剂量-长度乘积(DLP)。每次检查都计算了有效剂量和特定体型剂量,并与美国医学物理学家协会(AAPM)的要求进行了比较。为了进行定量图像质量分析,使用两种迭代重建技术(iDose 和迭代模型重建)测定了胸部不同区域的噪声、信噪比 (SNR) 和对比度-噪声比 (CNR)。通过独立样本 t 检验和同一患者组内的 Wilcoxon 符号秩检验,评估了普通体型和大体型患者在剂量和图像质量上的差异。独立样本 t 检验显示,平均尺寸和大尺寸患者的剂量值差异显著(p < .05)。普通体型患者的平均 CTDIvol 和 DLP 分别为 2.8 mGy 和 115 mGy.cm,大体型患者的剂量值也有适当增加。使用基于模型的迭代重建算法重建图像时,不同患者组之间的图像质量(图像噪声、信噪比和有线信噪比)没有明显差异。本研究评估的筛查方案得出的 CTDIvol 值符合 AAPM 建议。客观图像质量在患者组之间没有发现明显差异。
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