| Objectives To investigate the feasibility of using organ dose modulation technique to reduce gonadal radiation dose in 512-slice RevolutionCT pelvic plain scan.Methods Selected from September 2019 to January 2020 in our hospital during 512-storey Revolution CT pelvic scan into standard,160 cases of male patients,randomly divided into low dose group and routine group,80 cases for each group of patients.In the conventional group,the tube voltage of scanning parameters was 120 k V,and the tube current was automatic.In the low-dose group,the scan parameter tube voltage was 120 k V,and the tube current was based on the automatic tube current.The ODM mode was turned on,and the NI value of both groups was set as the preset value of 11.The relationship between age,weight and other basic data of the two groups of patients was compared,and the CT value,SD value,SD value of thigh fat,current and average tube current in the gonad area and the medial thigh muscle in the images of the two groups were measured and recorded respectively.SNR,CNR,image subjective quality score,CTDIvol and DLP of the two groups of patients were also measured and recorded.Results The gonadal CT values measured in the conventional group and the low-dose group were 29.19±3.23 HU and 28.71±3.03 HU,respectively,and the gonadal SD values were 7.5 ± 1.03 and 7.4 ± 0.93,respectively.There was no statistically significant difference in the CT values and SD values between the two groups(P > 0.05).The gonadal region SNR in the conventional group and the low-dose group were 3.95±0.61 and 3.93±0.57,and the gonadal region CNR in the gonadal group was 5.68±0.9 and 5.87±1.13,respectively.There was no statistically significant difference between the two groups in the gonadal region SNR and CNR(P > 0.05).The subjective quality score of doctors in the conventional group and the low-dose group was 4.63±0.53 and 4.65±0.57,respectively,and there was no statistically significant difference between the two groups(P > 0.05).The currents in the four directions of anterior,left,posterior and right of the gonadal region of the patients in the conventional group were 475.85±6.38 m A,475.93±5.82 m A,476.6±5.94 m A,475.8±5.87 m A,respectively;the currents in the four directions of anterior,left,posterior and right of the patients in the low-dose group were 349.05±5.66 m A,477.73±4.43 m A,478.85±3.61 m A,479.65±3.51 m A,respectively.The difference of anterior tube current in the two groups was statistically significant(P < 0.05),and the tube current in the low-dose group was significantly lower than that in the conventional group.The average tube current in the conventional group and the low-dose group was 476.2±5.98 m A and 446.8±2.86 m A,respectively.The difference in the two groups was statistically significant(P < 0.05).The average tube current in the low-dose group was significantly lower than that in the conventional group.CTDIvol and DLP in the conventional group were 12.3± 0.77 mgy and 315.31±21.35 m Gy*cm,respectively.CTDIvol and DLP in the low-dose group were 8.47±0.49 m Gy and 217.1±19.16 m Gy*cm,respectively.The radiation dose difference between the two groups was statistically significant(P < 0.05),and the radiation dose of the low-dose group was significantly lower than that of the conventional group.Conclusions By turning on organ dose modulation technology in the male pelvic CT scan,the tube current and radiation dose in the front of the patient's body can be significantly reduced without affecting the image quality,so as to effectively protect the gonad of the patient.Figure3;Table6;Reference 138... |
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