Aliasgharzadeh Akbar, Mihandoost Ehsan, Mohseni Mehran
Department of Radiology and Medical Physics, Faculty of Paramedical Sciences, Kashan University of Medical Sciences, Kashan, Iran.
Department of Medical Radiation Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran.
J Cancer Res Ther. 2018 Apr-Jun;14(3):549-552. doi: 10.4103/0973-1482.172713.
Nowadays, the use of computed tomography (CT) as a diagnostic tool has been considerably increased. Therefore, implementation of the program to conform the protection regulations on the CT scan is necessary to reduce the detrimental effects of radiation.
This study was performed to measure weighted CT dose index (CTDI) and dose length product (DLP) in routine CT protocols of the adult patients.
In this study, the patient dose was determined in routine CT protocols. The CT scanner used in this study was a single-slice Toshiba model. Scan parameters for each protocol were registered for 10 standard sized patients and then by applying it to the CT system, CTDI and DLP mean values were calculated and finally the values of dose were compared with the reference dose limit.
The mean values of CTDI and DLP for head, para nasal sinuses, chest, abdomen, and pelvis protocols were 34.11, 19.67, 15.47, 13.95, 10.08 mGy and 362.67, 153.97, 307.33, 346.07, 189.37 mGy.cm, respectively. The mean values of CTDI and DLP obtained in all of the protocols were less and even less than half in some of the protocols compared with the European guidelines and the UK reference values. However, mean values of CTDIw in the Chest and Abdomen protocols, were greater than IAEA reported values.
Using lower milli Amperes and higher kilo voltage peak as well as minimizing scan area and number of slices should be considered for more reduction in patients' dose.
如今，计算机断层扫描（CT）作为一种诊断工具的使用已大幅增加。因此，实施符合CT扫描防护规定的程序对于减少辐射的有害影响是必要的。
本研究旨在测量成年患者常规CT检查方案中的加权CT剂量指数（CTDI）和剂量长度乘积（DLP）。
在本研究中，在常规CT检查方案中确定患者剂量。本研究使用的CT扫描仪是单排东芝型号。为10名标准体型患者记录每个检查方案的扫描参数，然后将其应用于CT系统，计算CTDI和DLP的平均值，最后将剂量值与参考剂量限值进行比较。
头部、鼻窦、胸部、腹部和骨盆检查方案的CTDI和DLP平均值分别为34.11、19.67、15.47、13.95、10.08 mGy和362.67、153.97、307.33、346.07、189.37 mGy·cm。与欧洲指南和英国参考值相比，所有检查方案中获得的CTDI和DLP平均值均较低，在某些检查方案中甚至不到一半。然而，胸部和腹部检查方案中CTDIw的平均值高于国际原子能机构报告的值。
为了进一步降低患者剂量，应考虑使用更低的毫安数和更高的千伏峰值，以及尽量减少扫描区域和层数。
