Introduction of a figure of merit in digital mammography: Assessment of image quality and dosimetry

Congress:

EuroSafe Imaging 2019

Poster Number:

ESI-0054

Type:

EuroSafe Imaging

Keywords:

Action 5 - Performance indicators for radiation protection management, Radiation physics, Mammography, Physics, Quality assurance

Authors:

L. Marti-Bonmati, J. Chimeno, P. Gras, M. Sabater, N. Lopez, J. M. Campayo, J. I. Villaescusa

DOI:

10.26044/esi2019/ESI-0054

DOI-Link:

https://dx.doi.org/10.26044/esi2019/ESI-0054

Table 2: Table 1. Acceptable and achievable values for image quality test (CDMAM).(2)

Table 3: Table 2. Acceptable and achievable values of mean glandular dose for different...

Fig. 1: Figure 1. Contrast thickness threshold for the different systems analyzed. The...

Fig. 2: Figure 2. Analysis of variation of the mean glandular dose with PMMA thickness....

Background/introduction

AIM: The purpose of this study was to jointly analyze image quality and dosimetry in digital mammography by introducing a figure of merit, non-based on the contrast-noise relation. INTRODUCTION: Breast cancer is the most frequent among Spanish women and a disease with high impact worldwide. The screening procedure must provide: - Enough Image quality to allow the identification and assessment of masses, tumors and micro calcifications, without artifacts or the distortion of the breast anatomy. - Dose delivered must be As Low As Reasonable Achievable...

Description of activity and work performed

MATERIAL AND METHODS: 8 mammography systems were analyzed during 2016 y 2017: Giotto I3DL (3units), Fujifilm Amulet FDR (3 units) and Hologic Selenia (2 units). According to the Spanish protocol of quality assurance in radiodiagnostic (PECCRD)(1) , the image quality is evaluated with 6 different tests. In this study we focus on the following tests since we consider them relievable to assess image quality and dosimetry: -Image quality: Contrast thickness threshold The phantom CDMAM 3.4 was used in this test. This phantom contains gold discs...

Conclusion and recommendations

Several figures of merti have been published. Most of them used the CNR as indicator of image quality. Among them, we outline the most commonly used, Fm = CNR2/DG. Table 3 showes the assessment of both figures of merit for each system analyzed. The evaluation of both figures of merit is not consistent: - CNR could yield within a range for the same mammograph - CNR could be obtained following different methodologies making the direct comparison difficult. - Fm could give a better assessment to...

Personal/organisational information

Introduction of a figure of merit in digital mammography: Assessment of image quality and dosimetry Jose M Chimeno1, Gras P.1, Sabater M1, Lopez N1, Campayo JM1, Villaescusa JI1, Martí-Bonmatí L2 1. Department of Radiation protection, 2. Department of Medical Image, Hospital Universitario y Politécnico La Fe, Spain.

References

[1] SEFM-SEPR-SERAM. Protocolo Español de Control de Calidad en Radiodiagnóstico. Revisión 2011. Senda Editorial S.A. 2011 [2] Dance DR. Monte Carlo calculation of convertion factors for the estimation of mean glandular breast dose. Phys Med Biol 1990;35:1211-9. [3] European Commission Health and Consumers. European guidelines for quality assurance in breat cancer screening and diagnosis. European Commission 2013. Fourth Edition-Supplements.