[Derivation of Conversion Formula of Image Quality Figure (IQFinv) Values by Old and New Analysis Software for Mammographic Contrast-detail Phantom]

Abstract

Purpose: This study deals with the conversion of the image quality figure (IQF_inv) values with CDMAM Analyser ver. 1 (old analysis software) used to analyse the images of CDMAM 3.4 phantom into the IQF_inv values with a new analysis software, that is, CDMAM Analyser (ver. 2 and ver. 2.3), which is a software improved to be closer to human visual evaluation.

Methods: The IQF_inv values were calculated using four mammography units and three analysis software. The IQF_inv values using the old and new software were compared.

Results: The IQF_inv values had no difference according to mammography units and beam quality. The conversion formula of IQF_inv from CDMAM Analyser ver. 1 to CDMAM Analyser ver. 2 was derived. Furthermore, the conversion formula of IQF_inv from CDMAM Analyser ver. 1 to CDMAM Analysis ver. 2.3 was also derived.

Conclusion: Using each conversion formula, the IQF_inv values using the old software can be converted to those using the new software. There was a slight difference between the IQF_inv values using the new software.

Keywords: CDMAM phantom; contrast detail; digital mammography; image quality figure; quality control.