Abstract
Objectives: Evaluation of radiation efficiency of dual source high-pitch (DSHP) chest CT in comparison to single source technique with special regards to individual patient anatomy. Methods: 150 consecutive patients who underwent chest CT with automated tube current modulation were evaluated retrospectively and divided into three study groups, each with an equal quantity of 50 patients (DSHP vs. single source 128 slices vs. single source 16 slices). By using a dedicated workstation, volumetric analyses of each of the scanned anatomic area were performed and correlated to the individual dose length product (DLP). The calculated result was defined as dose efficiency. Results: DLP was 203 mGycm (DSHP), vs. 269 mGycm (single source) vs. 273 mGycm (16 slice CT). The total patient volume was lowest in the dual source group with 18956.3 cm 3 (vs. 22481.2 cm 3 vs. 22133.8 cm 3 ). With regards to the DLP, the calculated dose efficiency of dual source CT was better than the 128 slice CT (p = 0.045) and the 16 slice CT (p < 0.01). Conclusions: DSHP CT has considerably better dose efficiency compared to 16 slice CT. Compared to 128 slice single source technique, the high-pitch mode does not cause any dose penalty when performing chest CT.
Highlights
Multislice computed tomography (CT) is the current standard imaging modality for the in-depth and simultaneous assessment of the anatomy and pathology of thoracic organs, vessels and associated osseous structures
Radiation exposure of dual-source high-pitch (DSHP) CT is unknown for whole chest examinations since the amount of irradiated volume of lung parenchyma and soft tissue vary sharply among each patient and only slim patients can be examined with the DSHP mode
The demographics were similar in all groups: Mean age was 55.7 years with standard deviation of 14.3 years versus 59.1 years (14.8 years standard deviation, 128 slice CT group) versus 58.4 years (15.6 years standard deviation, 16 slice CT group), while the female-to-male ratios were 21:29, 19:31, and 24:26, respectively
Summary
Multislice computed tomography (CT) is the current standard imaging modality for the in-depth and simultaneous assessment of the anatomy and pathology of thoracic organs, vessels and associated osseous structures. This examination is usually performed using a breath-hold technique to minimize respiratory motion artifacts, which. Recent literature shows a comparable or decreased radiation dose when using the dual-source high-pitch (DSHP) examination technique for cardiac or pulmonary angiography CT studies which focus on limited parts of the thorax [7]-[10]. The purpose of this study is to analyze the patient radiation exposure of single and dualsource chest CT with regard to the influence of individual volumetric characteristics of the examined patients
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