The 118 image series were presented to the readers in a random order and the readers were blinded to the patient information and scan parameters which they interpreted.
The CT image data were interpreted by three readers (Y.O., K.H and H.H.) who have more than ten years’ experience as thoracic radiologists in there different countries (Germany, Japan and united states of America). The purpose of this study is to determine whether it is reasonable to accept a 50 mAs chest CT protocol as a routine protocol for general purposes. Direct comparison of the detection rate of several basic lung abnormalities between the low dose CT and standard dose CT will provide the useful data regarding the diagnostic accuracy of low dose CT examinations. To facilitate the use of low dose chest CT, adequacy of a low dose CT protocol as a routine protocol needs to be confirmed. Although there are several studies that assess the efficacy of low-dose CT protocols for various purposes, the evidence that standard-dose CT protocols can be routinely substituted for by low-dose CT is lacking. However, replacing a conventional chest CT routine protocol with a low-dose protocol is not a simple task, mainly because of the concern that the image quality degradation might make the correct recognition of findings difficult and consequently influence the diagnostic conclusion. Considering the possible adverse effect, the practice of keeping radiation dose as low as reasonably possible (ARALA principle) should be observed in medical imaging involving ionizing radiation.Īs CT is a major cause of radiation exposure buildup, low dose CT techniques is advisable unless it affects management decision. CT examinations account for majority of radiation exposure related to medical imaging. There is an increasing awareness of the possible adverse effects of diagnostic radiation exposure to the patients, because the medical radiation exposure has grown significantly as we utilize medical imaging more often.
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