Image quality index (IQI) for screen-film mammography

Desponds, L.; Depeursinge, C.; Grecescu, M; Hessler, C; Samiri, A; Valley, J.-F.

doi:10.1088/0031-9155/36/1/003

Cited by 32 publications

(27 citation statements)

References 15 publications

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“…It corresponds to a probability of correct observer decision higher than 96.8 % (12) . Figures 3 and 4 show the CNR measured on two mammography systems (GE Senographe Essential and Kodak CR 975 EHR-M) as a function of mean glandular breast dose for three PMMA thicknesses (20, 40 and 60 mm).…”

Section: Methodsmentioning

confidence: 99%

Using a NPWE model observer to assess suitable image quality for a digital mammography quality assurance programme

Monnin¹,

Bochud²,

Verdun³

2010

Radiation Protection Dosimetry

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A method of objectively determining imaging performance for a mammography quality assurance programme for digital systems was developed. The method is based on the assessment of the visibility of a spherical microcalcification of 0.2 mm using a quasi-ideal observer model. It requires the assessment of the spatial resolution (modulation transfer function) and the noise power spectra of the systems. The contrast is measured using a 0.2-mm thick Al sheet and Polymethylmethacrylate (PMMA) blocks. The minimal image quality was defined as that giving a target contrast-to-noise ratio (CNR) of 5.4. Several evaluations of this objective method for evaluating image quality in mammography quality assurance programmes have been considered on computed radiography (CR) and digital radiography (DR) mammography systems. The measurement gives a threshold CNR necessary to reach the minimum standard image quality required with regards to the visibility of a 0.2-mm microcalcification. This method may replace the CDMAM image evaluation and simplify the threshold contrast visibility test used in mammography quality.

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Section: Methodsmentioning

confidence: 99%

Using a NPWE model observer to assess suitable image quality for a digital mammography quality assurance programme

Monnin¹,

Bochud²,

Verdun³

2010

Radiation Protection Dosimetry

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“…contrast, resolution, and noise) were measured using the items available in the IQI test object (6,7) . The films were digitised with an ACS 100 Agfa scanner having a nominal resolution of 2400 dpi (dots per inch) and a dynamic range of 12 bits.…”

Section: Methodsmentioning

confidence: 99%

“…Objective methods Pseudo-objective methods IQI (6,7) NIJ (8) CD-M (8) FER (9) NRT (10) TMAX (11) TMAM (11) MTM (12) NEWC (13 objective methods, the IQI is the most sensitive method. However, its sensitivity is relatively low in comparison with other common scoring methods involving observers.…”

Section: Film Refmentioning

confidence: 99%

European Survey of Image Quality Assessment Methods Used in Mammography

Verdun¹,

Moeckli²,

Valley³

et al. 1998

Radiation Protection Dosimetry

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-The definition of reference dose levels has to be linked with the definition of image quality. Unfortunately, there is still no general agreement on the definition of image quality in mammography, and most of the protocols used are based on the detectability of objects having various shapes and contrasts. To facilitate the task of assessing image quality, scoring methods are often used to produce a single number representative of the imaging chain performance. The goal of this study is to present a comparison between different ways of assessing image quality commonly used in Europe. A set of five mammograms, having different image quality levels, has been obtained with several test objects and compared. The results show large sensitivity variations among the different methods. Concerted work between radiologists and physicists is still required to define the radiological tasks and develop objective ways to measure image quality in mammography.

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“…Finally noise is expressed in terms of the Selwyn coefficient G (Barrett and Swindell 1981, p. 215), which specifies the first-order statistics of the image noise. The image quality index has been applied to film-screen mammography by Desponds et al (1991).…”

Section: Other Image-quality Figuresmentioning

confidence: 99%