Abstract：
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.
摘要：
在这项研究中,对2019-22年测试期印度尼西亚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协议。共有87.8%的CT扫描仪无条件通过测试,8.8%通过条件测试，3.4%未通过测试。在有条件地通过测试的设备中，前两个原因是水CT数准确性（45.2％）和激光位置准确性（41.9％）。同时,75.0%的失败装置是由于未能满足患者剂量测试标准。水CT数精度参数测试失败是由于测试中使用的体模类型的变化引起的。其中几种类型的体模不使用水作为均匀性模块的材料。激光位置精度测试的失败是由调整到最小切片厚度的通过标准引起的，因此，具有小探测器尺寸和准直的现代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.在三大失败原因中，其中两个,即CT数量和剂量测试参数，已纳入最新法规(BAPETEN法规编号2/2022)随着评估方法的变化，对于激光位置精度测试，建议将通过标准更改为绝对值，即1毫米。
