Comparing raw data and dicom data according to use duration of digital radiography system

Abstract

With changes in diagnostic radiation generating apparatus, digital radiography (DR) systems are continuously increasing.The objective of this study was to compare Raw data and DICOM data according to the use period of DR system. In addition, this study conducted a constancy experiment in Korea for the first time.Based on measured value of the consistency test, it was measured after calibration for 1month and 4 months. Image quality change with time was then observed. Analysis of MTF curve was carried out with spatial resolutionintersection of MTF 10% and the curve was evaluated. Sharpness ratings were evaluated at the intersection of MTF 50% and the curve. Information transmission ability was measured up to 1.0-3.0lp/mm.Constancy test results showed that the Raw data information transmission ability was 1.0lp/mm 92%, 2.0lp/mm 79%, 3.0lp/mm 63%, MTF 10% 5.4lp/mm, and MTF 50% 3.9lp/mm. DICOMdata information transmission ability was 1.0lp/mm 94%, 2.0lp/mm 74%, 3.0lp/mm 63%, MTF 10% 5.1lp/mm, and MTF 50% 3.7lp/mm. In results of calibration after 1month and 4 months, based on constancy test value, the image quality decreased with time. It was measured higher than 1month and 4 months after calibration. Radiologists responsible for medical imaging will be able to improve the quality of life of patients as well as the quality of medical service if they can fully understand the evaluation method according to change of image and maintain medical image consistently.