Performance evaluation of a digital mammography unit using a contrast-detail phantom As a conclusion, the new design of double hole Contrast Detail phantom able to measure those parameters in a well manner.Г‚В«Г‚В less The effective focal spot of x-ray beam also has been shifted from the center of collimator as a result of off-position anode stem. Result revealed that Multiparameter Double Hole Contrast Detail phantom can visualize the shifted flaw image quality produced by x-ray machine due to improper position of the anode stem which is attached to rotor and stator. The thickness of double hole acrylic blocks is 13 mm. Small hole diameter (3 mm) is positioned on top of larger hole diameter (10 mm). The double hole differs from previous milled hole, whereby it consists of combination of different hole diameters. It can detect the image displacementmoreГ‚В Г‚В» which is due to off position of anode stem from its original location. In this study, a new design of Contrast Detail phantomГўв‚¬в„ўs hole which consists of double hole construction has been developed. This effect will lead to false appearance of image from its original location but it does not being visualized in the radiograph. It consists of drilled hole which gives effect to the penetration of x-ray beam divergence to pass through the base of each hole. Currently, its function is solely to evaluate the contrast detail characteristic of imaging system. Pauzi, Nur Farahana Majid, Zafri Azran Abdul Sapuan, Abdul HalimД¬ontrast Detail phantom is a quality control tool to analyze the performance of imaging devices. Multiparameter double hole contrast detail phantom: Ability to detect image displacement due to off position anode stem These limits are determined by the relationship between certain parameters of a digital mammography system and the set of the gold disks sizes in the CDMAM phantom. Construction of the ideal contrast detail curves for CDMAM phantom is an attempt to determine the quantitative limits of the CDMAM phantom as employed for image quality evaluation. The analysis carried out showed the existence of a nonlinear relationship between the above parameters, which means that use of different parameters of CDMAM image quality potentially can cause different conclusions about changes in image quality. The image quality parameters compared include: (1) contrast detail curve-a graph correlation between 'minimal correct reading' diameter and disk thickness (2) correct observation ratio-the ratio of the number of correctly identified objects to the actual total number of objects multiplied by 100 (3) image quality figure-the sum of the product of the diameter of the smallest scored object and its relative contrast (4) figure-of-merit-the zero disk diameter value obtained from extrapolation of the contrast detail curve to the origin (e.g., zero disk diameter) and (5) k-factor-the product of the thickness and the diameter of the smallest correctly identified disks. A correlation and comparison of five different quality parameters of the CDMAM phantom image determined for obtained ideal contrast detail curves is performed. The ideal contrast detail curves are constructed based on the requirement of having the same product of the diameter and contrast (disk thickness) of the minimal correctly determined object for every row of the CDMAM phantom image. In order to address this situation, the concept of ideal contrast detail curves is suggested. Published results of medical imaging studies which make use of contrast detail mammography (CDMAM) phantom images for analysis are difficult to compare since data are often not analyzed in the same way. Thomas, Jerry A Chakrabarti, Kish Kaczmarek, Richard Romanyukha, Alexander Contrast-detail phantom scoring methodology.

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