Application of Oversampling to obtain the MTF of Digital Radiology Equipment.

20th Argentinean Bioengineering Society Congress

物理学;生物科学

Narváez, M.^1 ; Graffigna, J.P.^1 ; Gómez, M.E.^1 ; Romo, R.^1

Gabinete de Tecnologia Médica, Facultad de Ingenieria, Universidad Nacional de San Juan, San Juan, Argentina^1

关键词: Contrastive analysis;    Different equipment;    Digital x-ray equipment;    Modulation transfer function (MTF);    Objective evaluation;    Processing algorithms;    Subjective evaluations;    Subjective methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/705/1/012057/pdf
DOI  :  10.1088/1742-6596/705/1/012057

学科分类：生物科学（综合）

来源: IOP

【 摘 要 】

Within the objectives of theproject Medical Image Processing for QualityAssessment ofX Ray Imaging, the present research work is aimed at developinga phantomX ray image and itsassociated processing algorithms in order to evaluatethe image quality rendered by digital X ray equipment. These tools are used to measure various image parameters, among which spatial resolution shows afundamental property that can be characterized by the Modulation Transfer Function (MTF)of an imaging system [1]. After performing a thorough literature surveyon imaging quality control in digital X film in Argentine and international publications, it was decided to adopt for this work the Norm IEC 62220 1:2003 that recommends using an image edge as a testingmethod. In order to obtain the characterizing MTF, a protocol was designedfor unifying the conditions under which the images are acquired for later evaluation. The protocol implied acquiring a radiography image by means of a specific referential technique, i.e. referred either to voltage, current, time, distance focus plate (/film?) distance, or other referential parameter, and to interpret the image through a system of computed radiology or direct digital radiology. The contribution of the work stems from the fact that, even though the traditional way of evaluating an X film image quality has relied mostly on subjective methods, this work presents an objective evaluative toolfor the images obtained with a givenequipment, followed by a contrastive analysis with the renderings from other X filmimaging sets.Once the images were obtained, specific calculations were carried out. Though there exist some methods based on the subjective evaluation of the quality of image, this work offers an objective evaluation of the equipment under study. Finally, we present the results obtained on different equipment.