The steady increase in the number of radiologic procedures being performed is undeniably having a beneficial impact on healthcare. However, it is also becoming common practice to quantify the health detriment from radiation exposure by calculating the number of cancer-related deaths inferred from the effective dose delivered to a given patient population. The inference of a certain number of expected deaths from the effective dose is to be discouraged, but it remains important as a means of raising professional awareness of the danger associated with ionizing radiation. The risk associated with a radiologic examination appears to be rather low compared with the natural risk. However, any added risk, no matter how small, is unacceptable if it does not benefit the patient. The concept of diagnostic reference levels should be used to reduce variations in practice among institutions and to promote optimal dose indicator ranges for specific imaging protocols. In general, the basic principles of radiation protection (eg, justification and optimization of a procedure) need to be respected to help counteract the unjustified explosion in the number of procedures being performed.
[Show abstract][Hide abstract] ABSTRACT: Purpose
To validate the feasibility of real time kinematography with four-dimensional (4D) dynamic functional wrist joint imaging using dual source CT.
Materials and Methods
Two healthy volunteers performed radioulnar deviation and pronation-supination wrist motions for 10 s and 4 s per cycle in a dual source CT scanner. Scan and reconstruction protocols were set to optimize temporal resolution. Cine images of the reconstructed carpal bone of the moving wrist were recorded. The quality of the images and radiation dosage were evaluated.
The 4D cine images obtained during 4 s and 10 s of radioulnar motion showed a smooth stream of movement with good quality and little noise or artifact. Images from the pronation-supination motion showed noise with a masked surface contour. The temporal resolution was optimized at 0.28 s.
Using dual source CT, 4D cine images of in vivo kinematics of wrist joint movement were obtained and found to have a shorter scan time, improved temporal resolution and lower radiation dosages compared with those previously reported.
Yonsei medical journal 07/2013; 54(4):1026-1032. DOI:10.3349/ymj.2013.54.4.1026 · 1.29 Impact Factor
"This news was published based on 245 new papers and was estimated that 149 million people were made aware of it.19 Since neonates and children are three to four times sensitive to ionization, radiation and CT, they should be aware of risk versus benefits of these exams.20 In September 2009, Radiological Society of North America (RSNA) described that doctors have to be familiar with strategies of reducing radiations to patients. "
[Show abstract][Hide abstract] ABSTRACT: Children are more sensitive to radiation than adults. Computerized tomography (CT) consists of 25 % of all medical imaging. It was estimated that more than 2% of all carcinomas in the USA are due to CT scans. There is an ongoing focus on the reduction of CT scan radiation dose. Awareness about risk-benefits of CT has increased. Reduction of radiological exam is an important issue because the accumulation effects of radiation can be hazardous. In addition, proper protocol should be followed for diagnostic procedures of ionization radiation and computerized tomography. Effective radiation dose should range from 0.8 to 10.5 millisievert. The same protocol should be followed in different hospitals as well. Basic principles of radiation protection should be monitored. As much as possible, both technician and radiologist must be present during computerized tomography for children, and MRI and ultrasound should be replaced if possible.
International journal of preventive medicine 03/2010; 1(4):220-2.
[Show abstract][Hide abstract] ABSTRACT: Computed tomographic (CT) pulmonary angiography (CTPA) has become the de facto clinical gold-standard for the diagnosis of pulmonary embolism (PE) due to its high sensitivity and specificity. Direct detection or exclusion of PE and diagnosis of various other diseases that mimic symptoms of PE can be accomplished in a single exam. In addition, CTPA allows rapid risk assessment by providing a number of predictive markers for accurate risk stratification and patient management. This article reviews the current role of routine CT techniques and recently introduced dual-energy CTPA for the diagnosis of PE as well as the role of CT for the assessment of right ventricular dysfunction in the setting of acute PE.
Current Cardiovascular Imaging Reports 12/2011; 4(6). DOI:10.1007/s12410-011-9112-6
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