In this study, an evaluation of the compliance test data from 684 computed tomography (CT)-scanners in Indonesia for the 2019–22 test period was carried out. The study was aimed to describe the performance profile of CT-scanners in Indonesia and evaluate the testing protocol. A total of 87.8% of the CT-scanners unconditionally passed the tests, 8.8% passed the tests with conditions and 3.4% failed the tests. Of the devices conditionally passed the tests, the top two causes were water CT number accuracy (45.2%) and laser position accuracy (41.9%). Meanwhile, 75.0% of the failed devices were due to failing to meet the patient dose test criteria. The failure of the test for the water CT number accuracy parameter was caused by variations in the type of phantom used in the test, where several types of phantoms did not use water as material of the homogeneity module. Failures in laser position accuracy test were caused by the passing criteria that adjust to the minimum slice thickness, so that modern CT-scanner with small detector sizes and collimations tend not to pass. On the other hand, the failure on dose aspects was due to the frequent unavailability of baseline values for comparison. Of these top three failure causes, two of them, namely the CT number and dose test parameters, have been accommodated in the latest regulation (BAPETEN Regulation No. 2/2022) with a change in the evaluation method, while for the laser position accuracy test it is recommended to alter the passing criteria to an absolute value, namely 1 mm.

中文翻译：

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印度尼西亚计算机断层扫描仪的性能评估：全国范围研究的建议

在这项研究中，对 2019-22 测试期间印度尼西亚 684 台计算机断层扫描 (CT) 扫描仪的合规性测试数据进行了评估。该研究旨在描述印度尼西亚 CT 扫描仪的性能概况并评估测试方案。共有87.8%的CT扫描仪无条件通过测试，8.8%有条件通过测试，3.4%未通过测试。在有条件通过测试的设备中，排名前两位的原因是水CT数字精度（45.2%）和激光位置精度（41.9%）。同时，75.0% 的失败设备是由于未能满足患者剂量测试标准造成的。水CT数精度参数测试失败的原因是测试中使用的体模类型不同，其中几种类型的体模不使用水作为均质模块的材料。激光位置精度测试失败的原因是调整到最小切片厚度的通过标准，因此探测器尺寸和准直较小的现代 CT 扫描仪往往无法通过。另一方面，剂量方面的失败是由于经常无法获得用于比较的基线值。在这三大失效原因中，其中两个，即CT数和剂量测试参数，已纳入最新法规（BAPETEN法规第2/2022号），并改变了评估方法，而激光位置精度测试时建议将通过标准改为绝对值，即1毫米。