Using (non-optimized) diagnostic exposure factors, effective doses for whole body CT in PET/CT examinations may amount up to 25 mSv 2-4 . As a result, the CT scan constitutes a significant additional...
Abstract:Positron emission tomography/computed tomography (PET/CT) scanner is an irreplaceable instrument in clinical diagnosis. The exposure dose that a patient receives is the sum of the doses caused by PET and CT examination. This stu...
The bowtie filter was introduced to compensate for the variation of patient attenuation at the level of the detector during scan rotation.4The filter is composed of a thinner and thicker segment. The thinner segment allows maximum beam intensity for ...
To assess the potential risk of harmful biological effects from exposure toionizing radiation, understanding the mechanisms by which radiation damage and repair occur is essential. Although radiation level and cancer risk follow a linear association at high doses, no strong relationship is apparent ...
Measurements of radiation exposure during routine CT scanning were found to average 4.2 R at the level of the ocular lens. This data was combined with CT scanning rate data from a sample of 100 patients followed in the myelomeningocele clinic. The number of scans averaged 7.75/patient with a...
It is important for healthcare providers to weigh the benefits of a CT scan against the potential risks for each individual patient. Alternative imaging techniques with lower radiation exposure, such as ultrasound or MRI, may be considered when appropriate. Patients should also be ...
诊断辐射剂量参考水平(diagnosticreferencelevel,DRL) 螺旋CT扫描时,在常规条件下某种特定检查程序对患者产生的辐射剂量水平。DRL包括全国DRL、地 区DRL及机构DRL。全国DRL的确定基于对全国大规模受检患者的辐射剂量学调查,通常选取全国调查数 据中典型的患者辐射剂量分布的第75个百分位数作为全国DRL。地区DRL则定义为某一...
Over one million European children undergo computed tomography (CT) scans annually. Although moderate- to high-dose ionizing radiation exposure is an established risk factor for hematological malignancies, risks at CT examination dose levels remain uncer
YonekuraY. Diagnostic reference levels based on latest surveys in Japan:Japan DRLs 2015[R]. Japanese Network for Research and Information on Medical Exposure. 2015. [40] LiangCR, ChenPXH, KapurJ, et al. Establishment of institutional diagnostic reference level for computed tomography with automated...
However, the combined acquisition of functional and anatomical images can substantially increase radiation exposure to patients, particularly when using a hybrid system with diagnostic CT capabilities. At the same time, the introduction of new SPECT and CT reconstruction techniques (based on the use of...