Can Three-Dimensional Reconstructed Image Replace Medical Photograph? / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: In recent years, medical recording by digital photography has become a useful tool in every field. Developments in digital techonology have enabled digital X-ray techniques as well as three-dimensional imaging tools such as CT and MRI. Digital data are processed to form three-dimensional images of the patient body and to provide virtual endoscopy. This study aims to widen the application of 3D images for medical recording. SUBJECTS AND METHOD: CT data from five patients with neck mass were used to make gross 3D images showing the lesion site with the aid of 3D-doctor 4.0 and RAPIDIA 3D ver. 2.8 (INFINITT healthcare , Seoul, Korea). Surface rendered images and volume rendered images were compared with the medical photos regarding identification, visibility of lesion, measuring, multidirectional view and reproducibility. RESULTS: 3D images could show real surface contour of the patients, including lesion sites. Shapes shown by the 3D images are exactly the same as the medical photographs, thus it was possible to measure the length and angles and view the image in any directions by rotating. CONCLUSION: Surface rendered and volume rendered images can be used as pre-operative recording tools.

Optimization of Exposure Condition and Photographic Techniques for Specimen and Devices in Neuroangiographic Suites / 신경중재치료의학

PURPOSE: We analyzed factors related to quality of photographs taken at neuroangiographic suites to optimize exposure condition. MATERIALS AND METHODS: We used a camera (EOS-300D, Canon Inc., Tokyo) with a standard- (EF-S 18-55 mm F3.5-5.6 USM, Canon Inc., Tokyo) and a macro-lens (EF 100 mm f/2.8 Macro USM, Canon Inc., Tokyo). Photographs were taken at a light-booth (1000 lux) and 2 neuroangiographic suites (988 and 856 lux) under ordinary intensity of illumination. We took photographs of a test chart (ColorChecker, X-rite, Michigan) and Kodak Q-13 Grey Scale Card at different values of aperture and shutter speed with fixed ISO of 400 and assessed the quality of photographs by Blade Pro (V1.1, Image group, Seoul). We analyzed photographs of a device at 1/25-1/80 shutter speed and F12 - 20 apertures and compared the result and also made visual assessment. RESULTS: Photographs of test chart and Grey Scale Card revealed that the best images chosen by Blade Pro were distributed in scattered range of quality which could help understand the range of optimum exposure condition but was not suitable for practical usage. We obtained reasonable quality photograph at shutter speed of 1/40 and aperture of F16 that can be used in 3 places. CONCLUSION: The most appropriate exposure condition when taking photographs in neuroangiographic suites could be explored. To get an optimal image in limited illumination, it is mandatory to select a fast enough shutter speed to avoid motion artifacts and a sufficient aperture to actualize the subject depth.