직접방식 Flat Panel Detector를 이용한 Tomosynthesis의 유용성 평가

Usability Evaluation of Tomosynthesis by Using Flat Panel Detector of Direct Conversion

Purpose : To conduct Digital Tomosynthesis by using 17” FPD-loaded body scanner, and to determine the possibility of application and the extent in clinical practices through evaluating its usability. Materials and Methods : We conducted Tomosynthesis to the 30 patients who has undergone examination or ongoing treatment in our hospital and other 9 volunteers depending on the objective part, and we selected 13 for chest and 11 for orthopedic implant-inserted knee joint among them as the object. We used CR System as the simple photography equipment, and Digital RIF System which loaded 17”direct conversion FPD was used for Tomosynthesis and we made burst shots then reconstructed the images with Filtered Back Projection. Results : The Tomosynthesis of chest showed comparatively higher visibility than simple photography at both main brochus, lung placed at the rear of heart, lung placed lower part at the rear of diaphragm, and the lower part ribs (p<0.01, p<0.05, p<0.01, p<0.001). There was no remarkable differences between Tomosynthesis and simple photography regarding the implant positioning of implant-inserted knee joint (p=1.000). However, in terms of cement positioning, bone- cement interface and cement- stem interface, the visibility level of Tomosynthesis was higher than simple photography (p<0.05, p<0.01, p<0.05). Conclusion : We found that Tomosynthesis would be able to clearly check the whole lung field, and would be the possible inspection with low amount of radiation dose in comparatively free pose without Artifact by metallic material. Therefore, we expect that the method will be able to be used for the orthopedic, respiratory organs and oral cavity fields.