Size-specific dose estimates calculated using patient size measurements from scanned projection radiograph in high-resolution chest computed tomography.

IF 1.8 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Journal of Medical Radiation Sciences Pub Date : 2024-10-24 DOI:10.1002/jmrs.830

Ajit Brindhaban

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Abstract

Introduction: Size-specific dose estimates (SSDE) are used to assess patient-specific radiation exposure in Computed Tomography (CT), complementing the volume CT dose index (CTDIvol). This study compared SSDE calculated using patient's lateral size from scan projection radiograph (SPR) with SSDE calculated using water equivalent diameter (D_w) from tomographic images in adult chest high-resolution CT (HRCT).

Methods: In a single-centre study, the CTDIvol and dose-length product (DLP) were recorded from HRCT dose reports of adult patients. Lateral width (SLat), at the centre of the scan range, from the SPR was measured and the SSDE (SSDE_R) was calculated using conversion factors related to SLat. Average CT number, area of the slice, and lateral size of the patient (AxLat) were measured on the middle slice. The D_w and SSDE from D_w (SSDE_W) were calculated. SSDE_R and SSDE_W were compared using Wilcoxon signed rank test. Correlation between patient size and dosimetry parameters were investigated using Spearman Correlation test with statistical significance at P < 0.05. Bland-Altman plot was also used to test agreement between the two SSDE values.

Results: Median CTDIvol, DLP, SSDE_R and SSDE_W were 11.0 mGy, 372 mGy.cm, 11.6 mGy and 12.9 mGy, respectively. Small but statistically significant differences (P < 0.03) were found between SLat and AxLat as well as between SSDE_R and SSDE_W. Bland-Altman analysis resulted in borderline agreement between SSDE values. Moderate correlations were observed between dosimetry quantities and patient size measurements (ρ > 0.640; P < 0.001). SSDEw showed statistically significant correlation (ρ = 0.587 and P < 0.001) with SSDE_R.

Conclusion: SSDE_R may be used to assess patients' absorbed radiation dose, before the scan, in adult chest HRCT. The median value of SSDE_R was about 10% lower than the median value SSDE_W. However, the SSDE_W should be used after the scan to establish effective dose and radiation risk to the patient.

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利用高分辨率胸部计算机断层扫描中扫描投影射线照片得出的患者体型测量值计算出的特定体型剂量估算值。

简介：尺寸特异性剂量估计值（SSDE）用于评估计算机断层扫描（CT）中患者的特异性辐射暴露，是对容积 CT 剂量指数（CTDIvol）的补充。这项研究比较了成人胸部高分辨率计算机断层扫描（HRCT）中使用扫描投影X光片（SPR）得出的患者体侧尺寸计算出的SSDE与使用断层扫描图像得出的水当量直径（Dw）计算出的SSDE：在一项单中心研究中，从成人患者的 HRCT 剂量报告中记录了 CTDIvol 和剂量-长度乘积 (DLP)。测量 SPR 扫描范围中心的侧宽（SLat），并使用与 SLat 相关的换算系数计算 SSDE（SSDER）。在中间切片上测量平均 CT 数量、切片面积和患者的侧向尺寸（AxLat）。计算出 Dw 和来自 Dw 的 SSDE（SSDEW）。使用 Wilcoxon 符号秩检验比较 SSDER 和 SSDEW。患者体型与剂量测定参数之间的相关性采用 Spearman 相关性检验进行研究，统计学意义为 P 结果：中位 CTDIvol、DLP、SSDER 和 SSDEW 分别为 11.0 mGy、372 mGy.cm、11.6 mGy 和 12.9 mGy。P R 和 SSDEW 的差异较小，但具有统计学意义。Bland-Altman 分析结果表明，SSDE 值之间的差异不大。剂量测定值与患者体型测量值之间存在中度相关性（ρ > 0.640; P R）：在成人胸部 HRCT 扫描前，SSDER 可用于评估患者吸收的辐射剂量。SSDER 的中值比 SSDEW 的中值低 10%。不过，SSDEW 应在扫描后使用，以确定患者的有效剂量和辐射风险。

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来源期刊

Journal of Medical Radiation Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

3.20

自引率

4.80%

发文量

审稿时长

8 weeks

期刊介绍： Journal of Medical Radiation Sciences (JMRS) is an international and multidisciplinary peer-reviewed journal that accepts manuscripts related to medical imaging / diagnostic radiography, radiation therapy, nuclear medicine, medical ultrasound / sonography, and the complementary disciplines of medical physics, radiology, radiation oncology, nursing, psychology and sociology. Manuscripts may take the form of: original articles, review articles, commentary articles, technical evaluations, case series and case studies. JMRS promotes excellence in international medical radiation science by the publication of contemporary and advanced research that encourages the adoption of the best clinical, scientific and educational practices in international communities. JMRS is the official professional journal of the Australian Society of Medical Imaging and Radiation Therapy (ASMIRT) and the New Zealand Institute of Medical Radiation Technology (NZIMRT).