Histogram Characteristics Analysis of Mass Objects in Quality-Control Phantom for Mammography Image Quality
R. P. Cahyani, R. Widita, F. Haryanto

Institut Teknologi Bandung

Abstract

This study presents a simple approach to objectively evaluate mammography image quality in the context of quality control by analyzing the characteristics of image histograms. The histogram analysis is still in its early stages- therefore, the focus of the analysis is on mass objects. Various values of tube voltage, with a tube current of 100 mAs and Mo/Mo filter, were used as parameters in the study. Tube voltage variations used were 24 kVp, 26 kVp, 28 kVp, 30 kVp, and 32 kVp. The research utilized Siemens Mammomat 3000 Nova mammography device with the Artinis PASMAM Constancy phantom as the research material. Objects of interest in the study were the mass of KP-ACR elements present in the phantom. The acquired image data were analyzed using Fiji and OriginLab software. The analyzed histogram characteristics included FWHM, skewness, and kurtosis. The resulting characteristic values were then compared with object scoring by medical physicists. The conclusions indicate that the FWHM values were approximately in the range of 60-85, 90-115, and 120-150 grey value for objects with score of 0, 0.5, and 1, respectively. However, the skewness and kurtosis values did not exhibit significant characteristics for objects with different score.

Keywords: histogram, mammography, mass, quality control

Topic: Biophysics and Medical Physics