RESUMEN
The diagnostic reference level (DRL) for adults radiation dose in CT examination based on a large-scale national survey data is released in the form of national health industry standards (WS/T 637-2018) after more than ten years of exploration by radiologists,imaging technologists,radiation protection specialists and radiographers.Its principles and method are in line with international practices and the actual situation in China,which basically cover frequently-used CT examination items for adults.Compared with DRL in several other countries or organizations,radiation exposure to the patients as a whole is at a reasonably low level.The 50th percentile (achievable dosimetry levels) and 25th percentile (indicative level of unusually low dosimetry) are given as additional tools for radiation dose optimization guidance.In daily activities of radiological diagnosis,the radiation dose should be matched with image quality and clinical diagnostic tasks,and the frequency of unjustifiable high or low radiation dose should be reduced.
RESUMEN
The diagnostic reference level (DRL) for adults radiation dose in CT examination based on a large-scale national survey data is released in the form of national health industry standards (WS/T 637-2018) after more than ten years of exploration by radiologists, imaging technologists, radiation protection specialists and radiographers. Its principles and method are in line with international practices and the actual situation in China, which basically cover frequently-used CT examination items for adults. Compared with DRL in several other countries or organizations, radiation exposure to the patients as a whole is at a reasonably low level. The 50th percentile (achievable dosimetry levels) and 25th percentile (indicative level of unusually low dosimetry) are given as additional tools for radiation dose optimization guidance. In daily activities of radiological diagnosis, the radiation dose should be matched with image quality and clinical diagnostic tasks, and the frequency of unjustifiable high or low radiation dose should be reduced.
RESUMEN
Optimal performance of pediatric cardiothoracic computed tomography (CT) is technically challenging and may need different approaches for different types of CT scanners. To meet the technical demands and improve clinical standards, a practical, user-friendly, and vendor-specific guideline for pediatric cardiothoracic CT needs to be developed for children with congenital heart disease (CHD). In this article, we have attempted to describe such guideline based on the consensus of experts in the Asian Society of Cardiovascular Imaging CHD Study Group. This first part describes the imaging techniques of pediatric cardiothoracic CT, and it includes recommendations for patient preparation, scan techniques, radiation dose, intravenous injection protocol, post-processing, and vendor-specific protocols.
Asunto(s)
Niño , Humanos , Pueblo Asiatico , Consenso , Cardiopatías Congénitas , Inyecciones IntravenosasRESUMEN
Objective@#To investigate the current status of CT radiation dose to adults in Ningxia, and provide basic data for developing the first diagnostic reference level of adults from CT scanning.@*Methods@#Stratified cluster sampling method was used to investigate the in-service status of CT scanners with various brands and different models in different grades of hospital in Ningxia. Interval sampling method was used to obtain everyday′s scanning parameters and radiation dose values from different types of scanning examinations in surveyed hostipitals. Basic information was collected include hospitals, CT scanner, scanning types and patients. CT scanning parameters, CTDIvol and DLP values were recorded, with effective dose values calculated. The data were statistically analyzed by examination types and comparation was made with the DRL values recommended by other countries.@*Results@#Finally, there were 45 medical institutions in this study, including 10 public tertiary A hospitals, 5 public tertiary B hospitals, 23 public secondary A hospitals, 5 private hospitals and 2 physical examination centers. 58 CT scanners from 6 manufacturers and 4 952 adult patients were investigated. The 75th percentile (P75) of CTDIvol, DLP, and E values of common scanning examinations were listed as follows: 65.67 mGy, 860.74 mGy·cm, and 1.64 mSv in skull scanning; 29.32 mGy, 490.00 mGy·cm, and 2.83 mSv in neck scanning; 36.92 mGy, 954.42 mGy·cm, and 4.87 mSv in neck enhanced scanning; 11.50 mGy, 382.06 mGy·cm , and 5.68 mSv in chest scanning; 45.80 mGy, 1 713.22 mGy·cm, and 25.01 mSv in chest enhanced scanning; 20.10 mGy, 506.59 mGy·cm, and 7.75 mSv in upper abdominal scanning; 50.07 mGy, 1 434.19 mGy·cm, and 21.94 mSv in upper abdominal enhanced scanning; 14.33 mGy, 670.78 mGy·cm, and 10.26 mSv in abdominal-pelvic scanning; 48.00 mGy, 2 294.00 mGy·cm, and 35.10 mSv in abdominal-pelvic enhanced scanning; 16.10 mGy, 471.58 mGy·cm, and 6.08 mSv in pelvic scanning; 31.04 mGy, 1 138.78 mGy·cm, and 14.69 mSv in pelvic enhanced scanning.@*Conclusions@#The CT scanning radiation doses to skull, neck, chest and pelvis in Ningxia are slightly lower than, or similar to, in other countries, but the abdominal scanning dose is significantly higher than that in other countries. It is necessary to optimize the abdominal CT scanning protocol.
RESUMEN
Objective To investigate the current status of CT radiation dose to adults in Ningxia, and provide basic data for developing the first diagnostic reference level of adults from CT scanning. Methods Stratified cluster sampling method was used to investigate the in-service status of CT scanners with various brands and different models in different grades of hospital in Ningxia. Interval sampling method was used to obtain everyday' s scanning parameters and radiation dose values from different types of scanning examinations in surveyed hostipitals. Basic information was collected include hospitals, CT scanner, scanning types and patients. CT scanning parameters, CTDIvol and DLP values were recorded, with effective dose values calculated. The data were statistically analyzed by examination types and comparation was made with the DRL values recommended by other countries. Results Finally, there were 45 medical institutions in this study, including 10 public tertiary A hospitals, 5 public tertiary B hospitals, 23 public secondary A hospitals, 5 private hospitals and 2 physical examination centers. 58 CT scanners from 6 manufacturers and 4952 adult patients were investigated. The 75th percentile (P75) of CTDIvol, DLP, and E values of common scanning examinations were listed as follows: 65.67 mGy, 860.74 mGy·cm, and 1.64 mSv in skull scanning;29.32 mGy, 490. 00 mGy·cm, and 2.83 mSv in neck scanning;36. 92 mGy, 954. 42 mGy·cm, and 4. 87 mSv in neck enhanced scanning; 11. 50 mGy, 382.06 mGy·cm , and 5.68 mSv in chest scanning; 45.80 mGy, 1713.22 mGy·cm, and 25.01 mSv in chest enhanced scanning; 20. 10 mGy, 506. 59 mGy·cm, and 7. 75 mSv in upper abdominal scanning;50. 07 mGy, 1434. 19 mGy·cm, and 21. 94 mSv in upper abdominal enhanced scanning; 14. 33 mGy, 670.78 mGy·cm, and 10. 26 mSv in abdominal-pelvic scanning; 48. 00 mGy, 2294. 00 mGy·cm, and 35.10 mSv in abdominal-pelvic enhanced scanning;16.10 mGy, 471.58 mGy·cm, and 6.08 mSv in pelvic scanning;31.04 mGy, 1138. 78 mGy·cm, and 14. 69 mSv in pelvic enhanced scanning. Conclusions The CT scanning radiation doses to skull, neck, chest and pelvis in Ningxia are slightly lower than, or similar to, in other countries, but the abdominal scanning dose is significantly higher than that in other countries. It is necessary to optimize the abdominal CT scanning protocol.
RESUMEN
OBJECTIVE: To determine whether the body size-adapted volume computed tomography (CT) dose index (CTD(vol)) in pediatric cardiothoracic CT with tube current modulation is better to be entered before or after scan range adjustment for radiation dose optimization. MATERIALS AND METHODS: In 83 patients, cardiothoracic CT with tube current modulation was performed with the body size-adapted CTDIvol entered after (group 1, n = 42) or before (group 2, n = 41) scan range adjustment. Patient-related, radiation dose, and image quality parameters were compared and correlated between the two groups. RESULTS: The CTDIvol after the CT scan in group 1 was significantly higher than that in group 2 (1.7 ± 0.1 mGy vs. 1.4 ± 0.3 mGy; p 0.05). In both groups, all patient-related parameters, except body density, showed positive correlations (r = 0.49–0.94; p 0.05) in group 2. CONCLUSION: In pediatric cardiothoracic CT with tube current modulation, the CTDIvol entered before scan range adjustment provides a significant dose reduction (18%) with comparable image quality compared with that entered after scan range adjustment.