Influence of the Different Multi- Detectors CT scans in Radiation Dose and Image Quality in Brain Examinations
Background: Multidetector computed tomography (MDCT) has become a standard imaging modality for many clinical applications due to its wide availability, reduced invasiveness, rapid scanning time, superior anatomical resolution, and increased diagnostic value. Both the patient's radiation exposure and the level of anxiety surrounding this matter have increased. Objective: The aim of this study is to assess image quality related to patient radiation dose for multidetector computed tomography in abdomen CT examinations. Patients and Methods: 30 patients from four hospitals underwent abdomen scans using 16, 32, and 64-slice (CT) scanners. To calculate image quality and estimate dosage, clinical image data were employed. CNR and SNR's calculation of image quality. From the image display, the CT dose volume index (CTDIv) and dose length product (DLP) were recorded Results: Regarding the radiographic parameters, the mean value of radiation doses (CTDIv, DLP and ED) to patients were higher from 64 slice scanner for the abdomen CT scan examination (19.56±3.2, 1046±247.4 and 15.68±3.71) respectively. It was significantly lower in 32 and 16 slice multi detector CT (17.71±2.62, 718±5.88 and 10.76±0.09) (15.63±0.311, 619±101.5 and 9.3±1.52) respectively. Regarding image quality assessment, the SNR and CNR are compared among the patients examined in three types of MDCT. The higher SNR associates a multi-detector row 64-MDCT. The means of SNR and P-value are (3.52±1.98, 3.62±1.61, 7.47±2.07 and 0.001) respectively. Conclusion:, The mean value of radiation doses (CTDIv in mGy, DLP in mGy.cm, and ED in mSv) was higher in 64 than 32 and lower in 16 in an abdominal CT scan. Image quality SNR and CNR of abdomen MDCT scan images improve with increase the detector of CT scan.
Multi-detector CT scan, Radiation dose, Image quality, Contrast to Noise Ratio, Signal to Noise Ratio.