在螺旋计算机断层扫描中使用固态探测器和带有铅孔的单旋转技术测量半值层,带锡滤波器和不带锡滤波器。

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Radiological Physics and Technology Pub Date : 2024-03-01 Epub Date: 2023-12-21 DOI:10.1007/s12194-023-00767-6
Atsushi Fukuda, Nao Ichikawa, Takuma Hayashi, Ayaka Hirosawa, Kosuke Matsubara
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引用次数: 0

摘要

固态探测器(SSD)可与铅准直器一起使用,在使用或不使用锡滤波器的情况下通过计算机断层扫描(CT)进行半值层(HVL)测量。我们的目的是比较使用三种固态探测器(AGMS-DM+、X2 R/F 传感器和 Black Piranha)和使用带铅孔的单旋转技术(SRTLA)获得的 HVL 测量结果。HVL 测量使用螺旋 CT 进行,管电压为 70-140 kV(不带锡滤波器)和 100-140 kV(Sn 100-140 kV)(带锡滤波器),以 10 kV 为增量。对于 SRTLA,在等中心处悬挂了一个 0.6 毫升的电离室,以测量自由空气中的开尔马速率([公式:见正文])值。在龙门盖上使用铅片开了五个孔,并在这些孔上放置了四块铝板。SRTLA 中的 HVL 由[公式:见正文]下降曲线得出。随后,将插入铅准直器的固态硬盘放在龙门盖上,用来测量 HVL。AGMS-DM+ 、X2 R/F 传感器和 Black Piranha 相对于 SRTLA(无/有锡滤波器)的最大 HVL 差值分别为 - 0.09/0.6(只有两个 Sn 100-110kV)毫米、- 0.50/ - 0.6 毫米和 - 0.17/(无数据)毫米。这些值都在规格限制范围内。插入铅准直器的 SSD 可用螺旋 CT 测量 HVL,无需锡滤波器。仅使用 X2 R/F 传感器就可以测量带锡滤波器的 HVL,与其他固态硬盘相比,其校准精度有待进一步提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Half-value layer measurements using solid-state detectors and single-rotation technique with lead apertures in spiral computed tomography with and without a tin filter.

Solid-state detectors (SSDs) may be used along with a lead collimator for half-value layer (HVL) measurement using computed tomography (CT) with or without a tin filter. We aimed to compare HVL measurements obtained using three SSDs (AGMS-DM+ , X2 R/F sensor, and Black Piranha) with those obtained using the single-rotation technique with lead apertures (SRTLA). HVL measurements were performed using spiral CT at tube voltages of 70-140 kV without a tin filter and 100-140 kV (Sn 100-140 kV) with a tin filter in increments of 10 kV. For SRTLA, a 0.6-cc ionization chamber was suspended at the isocenter to measure the free-in-air kerma rate ( K ˙ air ) values. Five apertures were made on the gantry cover using lead sheets, and four aluminum plates were placed on these apertures. HVLs in SRTLA were obtained from K ˙ air decline curves. Subsequently, SSDs inserted into the lead collimator were placed on the gantry cover and used to measure HVLs. Maximum HVL differences of AGMS-DM+ , X2 R/F sensor, and Black Piranha with respect to SRTLA without/with a tin filter were - 0.09/0.6 (only two Sn 100-110 kV) mm, - 0.50/ - 0.6 mm, and - 0.17/(no data available) mm, respectively. These values were within the specification limit. SSDs inserted into the lead collimator could be used to measure HVL using spiral CT without a tin filter. HVLs could be measured with a tin filter using only the X2 R/F sensor, and further improvement of its calibration accuracy with respect to other SSDs is warranted.

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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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