Caracterização de sistemas de mamografia digital no domínio da frequência para diferentes condições de exposição

Authors

Keywords:

digital detectors, response curve, noise evaluation, MTF, NNPS, DQE

Abstract

The strong advance of digital mammography in Brazil as a breast cancer screening tool requires that the new digital systems available be characterized. Radiology quality assurance programs are designed to ensure that certain levels of image quality are maintained in imaging equipment. Recent measurements introduced in digital mammography protocols indicate large variations in the evaluated parameters, pointing to the different detectors used as the main factor. A comprehensive and quantitative assessment of the spatial resolution of a system can be obtained from its modulation transfer function (MTF). Robust measurements of noise can be made from normalized noise power spectrum (NNPS) and quantum detection efficiency (DQE) as a function of spatial frequency at various exposure levels. The objective of this work is to characterize in terms of MTF, NNPS and DQE several mammography systems, determining their basic objective characteristics of resolution and noise at different levels of air kerma at the detector input plane (DAK). The CR Carestream EHR-M3 detector, the small field digital mammography system Siemens Opdima, and full field digital mammography systems Planmed Clarity, GE Essential, GE Pristina and GE Crystal Nova were characterized. The basic performance of the tested systems was evaluated in terms of response function, evaluation of noise components, MTF, NNPS and DQE using European Guidelines protocol. The attenuated beam qualities (obtained with additional 2 mm Al filtration) used were 28 kVP with Mo/Mo anode/filter combination for EHR-M3, Opdima, Essential and Pristina; 28 kVP with Mo/Rh for EHR-M3; 28 kVP with W/Rh for the system Crystal Nova; 28 kVP with W/Ag for the Clarity; and 34 kVP Rh/Ag for the Pristina. As expected, the CR system showed a logarithmic response, and the DR systems showed a linear response (R² > 0.999). The Pristina system showed higher slope and intercept for the Rh/Ag beam. Noise evaluation showed that EHR-M3 is quantum limited up to 650 µGy (Mo/Mo) and 380 µGy (Mo/Rh), while Opdima is quantum limited up to 300 µGy. For higher DAK values, structural noise is the dominant noise source. For the Opdima detector, structural noise is related to the presence of low frequency inhomogeneities in the data, while for CR detectors it is related to the size of the phosphor grains. The other systems are quantum limited in the evaluated DAK range. The evaluated systems presented reasonably isotropic MTF. MTF showed no dependence with beam quality for EHR-M3 and Pristina detectors. The Clarity system had the highest MTF values, followed by the Opdima and Essential, Pristina, EHR-M3 and Crystal Nova systems. NNPS increased with decreasing DAK. For the Pristina system, the NNPS decreased with increasing beam energy. The Crystal Nova system showed the lowest NNPS values. DQE increased, reached a maximum and then decreased with increasing DAK. The DAK range which maximizes DQE depended on system noise composition. DQE was influenced by beam energy. The Crystal Nova system showed the best performance in terms of DQE for low spatial frequency. Opdima and Clarity systems exhibited higher DQE for high spatial frequencies. Agreement with data from literature indicates that the systems evaluated are operating under typical conditions. Evidence of improvement in detectors performance was found.

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Published

2024-06-18

How to Cite

Maia Marques Martinez Perez, A., & Poletti, M. E. (2024). Caracterização de sistemas de mamografia digital no domínio da frequência para diferentes condições de exposição. Brazilian Journal of Medical Physics, 18, 785. Retrieved from https://rbfm.emnuvens.com.br/rbfm/article/view/785

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