Our study aims to determine diagnostic reference levels (DRL) for chest front examination in postero anterior (PA) for optimizing patient entrance surface dose (ESD) and dose-area product (DAP) of patients in west of ...Our study aims to determine diagnostic reference levels (DRL) for chest front examination in postero anterior (PA) for optimizing patient entrance surface dose (ESD) and dose-area product (DAP) of patients in west of Côte d’Ivoire. 90 patients from three hospitals undergoing conventional radiology were considered. The ESD and DAP for each patient were obtained during chest radiography (PA) examination. The measurements were performed with the device call Dose-Area Product-meter (DAP-meter) with brand Diamentor M4-KDK, type 11017. The DRL were obtained in applying the 75th percentile statistical method to the obtained ESD and DAP. The obtained DRL in ESD for chest radiography for all rooms is 0.40 mGy and in DAP is 54.85 cGy·cm2. Our DRL for ESD is higher than those obtained in Abidjan District and in other countries like UK and Cameroon. Our DRL for DAP is higher than those from Abidjan and all other countries for which a similar study was made. The comparison of these values to those from Abidjan and other countries, shows us that radiology technicians can make efforts to choose radiological parameters to reduce ESD. They must use convenable the X-rays tube to reduce DAP by reducing the patient exposure surface.展开更多
目的通过现场调查ERCP手术的相关参数,模拟ERCP手术的全过程,借助水模体,测量面积剂量乘积(Dose Area Product,DAP),为估算患者受照剂量提供基础数据。方法现场调查记录ERCP过程中设备的相关参数(主要是透视时间及摄片帧数),并以记录的...目的通过现场调查ERCP手术的相关参数,模拟ERCP手术的全过程,借助水模体,测量面积剂量乘积(Dose Area Product,DAP),为估算患者受照剂量提供基础数据。方法现场调查记录ERCP过程中设备的相关参数(主要是透视时间及摄片帧数),并以记录的设备相关参数为投照条件,用水模替代人体,测量DAP。结果共调查56例ERCP手术,其中胆总管结石取石49例(87.5%)、支架置入7例(12.5%)。透视时间为1.3~27.3min,平均为(6.9±6.0)min;摄片帧数为0~14帧,平均为(4±3)帧;DAP为3.2~58.5 Gy·cm^2,平均为(15.0±12.9)Gy·cm^2。结论透视时间与DAP有较好的相关性,r=0.999,P<0.01;透视导致的DAP在ERCP中占96%;胆管支架置入术的透视时间比胆总管取石术略长,相应地,胆管支架置入术的DAP略高于胆总管结石取石术。由于手术操作的复杂性和操作者的熟练程度的不同,导致患者的DAP差别较大。展开更多
目的探讨颈椎低剂量数字化X线摄影的应用价值。方法在对60例颈椎外伤患者初诊与复查时,分别以常规剂量和低剂量进行颈椎正、侧位数字化X线摄影,获得常规组和低剂量组各120幅图像,并对其曝光量和剂量面积值(dose area product,DAP)进行...目的探讨颈椎低剂量数字化X线摄影的应用价值。方法在对60例颈椎外伤患者初诊与复查时,分别以常规剂量和低剂量进行颈椎正、侧位数字化X线摄影,获得常规组和低剂量组各120幅图像,并对其曝光量和剂量面积值(dose area product,DAP)进行对比。结果①低剂量组颈椎正、侧位摄影的曝光量值和DAP明显均低于常规组(P<0.01)。②两组图像质量差异无统计学意义(Manne-Whitney U=1180.00,P=0.35)。结论颈椎低剂量数字化X线摄影可明显降低曝光量和吸收剂量,而不影响图像质量。展开更多
目的:比较冠状动脉造影不同体位的辐射剂量。方法:采用PHILIP Allura Xper FD 20进行冠状动脉造影患者77例。分别选择头位30o、足位30o、右肩位、左肩位、肝位、蜘蛛位进行左冠状动脉造影;选择左前斜45o和头倾30o进行右冠状动脉造影。...目的:比较冠状动脉造影不同体位的辐射剂量。方法:采用PHILIP Allura Xper FD 20进行冠状动脉造影患者77例。分别选择头位30o、足位30o、右肩位、左肩位、肝位、蜘蛛位进行左冠状动脉造影;选择左前斜45o和头倾30o进行右冠状动脉造影。记录每位患者总的透视时间(FT)、累积剂量(CD)和剂量面积乘积(DAP)以及每个体位的投照角度、采集图像总数、管电压、管电流和DAP值,计算不同体位单帧图像的DAP值并进行比较。结果:77例患者平均FT、CD和DAP值分别为216.56±115.52s、281.28.±126.28mGy和34114.74±16587.81 mGy.cm^2。左冠状动脉造影6个体位中,左前斜位的DAP值显著高于头足位和右前斜位,差异具有统计学意义(P值均<0.05);头足方向即左肩位和蜘蛛位、头位和足位、右肩位和肝位之间的DAP值差异均没有统计学意义(P值均>0.05)。结论:冠状动脉造影不同投照体位对辐射剂量有影响;球管左右方向倾斜对辐射剂量影响较大,球管头足方向倾斜对辐射剂量影响不明显;利用单帧图像的DAP值进行辐射剂量对比研究,方法简单,易于推广。展开更多
Diagnostic Reference Levels (DRLs) are indicators that allow assessing the quality of equipment and procedures from the point of view of the doses delivered to patients and subsequently initiate corrective actions if ...Diagnostic Reference Levels (DRLs) are indicators that allow assessing the quality of equipment and procedures from the point of view of the doses delivered to patients and subsequently initiate corrective actions if necessary. The purpose of this study is to encourage health professionals to investigate patient radiation doses and to determine whether those doses comply with the principles of radiation protection in medical fields so as to improve practices by reducing patient exposure without reducing clinical effectiveness. To perform this work, we have investigated patient doses for different radiological examinations from six (6) medical centers in Dakar, including the following nine routine types: chest (PA), abdomen (AP), pelvis (AP), cervical spine (AP), lumbar spine (AP, Lat), hip (AP), thoracic spine (AP, Lat). Three types of data were collected, <em>i.e.</em>, X-ray tube machine data, patient data and output measurements. The data were analyzed statistically and the median, minimum, maximum, and third quartile values were calculated and displayed throughout boxplots graphs for all exams and medical centers. The two sigma range (95% confidence interval) was also checked. Comparison of third quartiles of Entrance Surface Dose (ESD) and Dose Area Product (DAP) by type of examination with recommended international DRLs was performed. The third quartile of ESD for pelvis (AP) and thoracic spine (AP) was up to 16% and 38% higher, respectively than their corresponding DRLs in the European Commission Report RP 180 Part 2. For all exams, except thoracic spine (lat), the third quartiles of the dose area product were higher than the corresponding DRLs in the above report. The source of dose variability between medical centers was related to many parameters such as poor radiographic techniques, lack of modern X-ray machines and adequately documented radiation protection practices. The results show the need to develop protocols for dose measurement as well as to carry out quality assurance programs and dose optimiz展开更多
Purpose: Increasing physician awareness of patient exposure to radiation is an important step towards the reduction of potentially harmful effects of radiation. Published studies demonstrated that providing physicians...Purpose: Increasing physician awareness of patient exposure to radiation is an important step towards the reduction of potentially harmful effects of radiation. Published studies demonstrated that providing physicians with feedback regarding their fluoroscopy time leads to a reduction in average fluoroscopy times. The aim of this work was to analyze and publish our medical center data observed during the past year;fluoroscopy time (FT), Dose Area Product (DAP) and cumulative dose (CD) were monitored for radiation protection purposes. Methods: Fluoroscopy time is one of multiple radiation dose indices used in radiation safety auditing. Such auditing is nowadays turning into requirement of patient care safety and quality improvement;as indicated by accreditation bodies both nationally and internationally. All non-cardiac procedures performed outside radiology department by surgeons and interventionists are viewed. FT, DAP and CD are extracted for analysis. Results: a total of 846 cases were studied (643 orthopedic, 99 others, 73 urology, 17 chest, 7 vascular and 4 ERCP cases). Mean FT was 1.3 minutes, mean CD to the patient was 12.98 mGy and the mean DAP was 4.53 Gy/cm2. The longest FT noted was 55 min. The maximum CD was 904 mGy and the maximum DAP was 689 Gy/cm2. Using spearman’s correlation test we found out that there is a significant correlation between FT and DAP (correlation coefficient = 0.615, p. value 0.001). There is a significant correlation between FT and CD (correlation coefficient = 0.628, p. value 0.001). Conclusion: Information about FT that used in each procedure can be used as a tool for patient dose optimization. As we found a significant correlation between DAP as well as CD. Reducing fluoroscopic time (FT) is a radiation protection goal, since it serves the purpose of protection for both the patient and the workers.展开更多
文摘Our study aims to determine diagnostic reference levels (DRL) for chest front examination in postero anterior (PA) for optimizing patient entrance surface dose (ESD) and dose-area product (DAP) of patients in west of Côte d’Ivoire. 90 patients from three hospitals undergoing conventional radiology were considered. The ESD and DAP for each patient were obtained during chest radiography (PA) examination. The measurements were performed with the device call Dose-Area Product-meter (DAP-meter) with brand Diamentor M4-KDK, type 11017. The DRL were obtained in applying the 75th percentile statistical method to the obtained ESD and DAP. The obtained DRL in ESD for chest radiography for all rooms is 0.40 mGy and in DAP is 54.85 cGy·cm2. Our DRL for ESD is higher than those obtained in Abidjan District and in other countries like UK and Cameroon. Our DRL for DAP is higher than those from Abidjan and all other countries for which a similar study was made. The comparison of these values to those from Abidjan and other countries, shows us that radiology technicians can make efforts to choose radiological parameters to reduce ESD. They must use convenable the X-rays tube to reduce DAP by reducing the patient exposure surface.
文摘目的通过现场调查ERCP手术的相关参数,模拟ERCP手术的全过程,借助水模体,测量面积剂量乘积(Dose Area Product,DAP),为估算患者受照剂量提供基础数据。方法现场调查记录ERCP过程中设备的相关参数(主要是透视时间及摄片帧数),并以记录的设备相关参数为投照条件,用水模替代人体,测量DAP。结果共调查56例ERCP手术,其中胆总管结石取石49例(87.5%)、支架置入7例(12.5%)。透视时间为1.3~27.3min,平均为(6.9±6.0)min;摄片帧数为0~14帧,平均为(4±3)帧;DAP为3.2~58.5 Gy·cm^2,平均为(15.0±12.9)Gy·cm^2。结论透视时间与DAP有较好的相关性,r=0.999,P<0.01;透视导致的DAP在ERCP中占96%;胆管支架置入术的透视时间比胆总管取石术略长,相应地,胆管支架置入术的DAP略高于胆总管结石取石术。由于手术操作的复杂性和操作者的熟练程度的不同,导致患者的DAP差别较大。
文摘目的探讨颈椎低剂量数字化X线摄影的应用价值。方法在对60例颈椎外伤患者初诊与复查时,分别以常规剂量和低剂量进行颈椎正、侧位数字化X线摄影,获得常规组和低剂量组各120幅图像,并对其曝光量和剂量面积值(dose area product,DAP)进行对比。结果①低剂量组颈椎正、侧位摄影的曝光量值和DAP明显均低于常规组(P<0.01)。②两组图像质量差异无统计学意义(Manne-Whitney U=1180.00,P=0.35)。结论颈椎低剂量数字化X线摄影可明显降低曝光量和吸收剂量,而不影响图像质量。
文摘Diagnostic Reference Levels (DRLs) are indicators that allow assessing the quality of equipment and procedures from the point of view of the doses delivered to patients and subsequently initiate corrective actions if necessary. The purpose of this study is to encourage health professionals to investigate patient radiation doses and to determine whether those doses comply with the principles of radiation protection in medical fields so as to improve practices by reducing patient exposure without reducing clinical effectiveness. To perform this work, we have investigated patient doses for different radiological examinations from six (6) medical centers in Dakar, including the following nine routine types: chest (PA), abdomen (AP), pelvis (AP), cervical spine (AP), lumbar spine (AP, Lat), hip (AP), thoracic spine (AP, Lat). Three types of data were collected, <em>i.e.</em>, X-ray tube machine data, patient data and output measurements. The data were analyzed statistically and the median, minimum, maximum, and third quartile values were calculated and displayed throughout boxplots graphs for all exams and medical centers. The two sigma range (95% confidence interval) was also checked. Comparison of third quartiles of Entrance Surface Dose (ESD) and Dose Area Product (DAP) by type of examination with recommended international DRLs was performed. The third quartile of ESD for pelvis (AP) and thoracic spine (AP) was up to 16% and 38% higher, respectively than their corresponding DRLs in the European Commission Report RP 180 Part 2. For all exams, except thoracic spine (lat), the third quartiles of the dose area product were higher than the corresponding DRLs in the above report. The source of dose variability between medical centers was related to many parameters such as poor radiographic techniques, lack of modern X-ray machines and adequately documented radiation protection practices. The results show the need to develop protocols for dose measurement as well as to carry out quality assurance programs and dose optimiz
文摘Purpose: Increasing physician awareness of patient exposure to radiation is an important step towards the reduction of potentially harmful effects of radiation. Published studies demonstrated that providing physicians with feedback regarding their fluoroscopy time leads to a reduction in average fluoroscopy times. The aim of this work was to analyze and publish our medical center data observed during the past year;fluoroscopy time (FT), Dose Area Product (DAP) and cumulative dose (CD) were monitored for radiation protection purposes. Methods: Fluoroscopy time is one of multiple radiation dose indices used in radiation safety auditing. Such auditing is nowadays turning into requirement of patient care safety and quality improvement;as indicated by accreditation bodies both nationally and internationally. All non-cardiac procedures performed outside radiology department by surgeons and interventionists are viewed. FT, DAP and CD are extracted for analysis. Results: a total of 846 cases were studied (643 orthopedic, 99 others, 73 urology, 17 chest, 7 vascular and 4 ERCP cases). Mean FT was 1.3 minutes, mean CD to the patient was 12.98 mGy and the mean DAP was 4.53 Gy/cm2. The longest FT noted was 55 min. The maximum CD was 904 mGy and the maximum DAP was 689 Gy/cm2. Using spearman’s correlation test we found out that there is a significant correlation between FT and DAP (correlation coefficient = 0.615, p. value 0.001). There is a significant correlation between FT and CD (correlation coefficient = 0.628, p. value 0.001). Conclusion: Information about FT that used in each procedure can be used as a tool for patient dose optimization. As we found a significant correlation between DAP as well as CD. Reducing fluoroscopic time (FT) is a radiation protection goal, since it serves the purpose of protection for both the patient and the workers.
