Objective assessment of mammography systems. Part I: Method.

Hessler, C; Depeursinge, C.; Grecescu, M; Pochon, Y.; Raimondi, S.; Valley, J.-F.

doi:10.1148/radiology.156.1.4001409

Cited by 22 publications

(13 citation statements)

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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%

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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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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 precision on the IQI measurements is in the order + 0.005 mm. This method is fully objective and has been described elsewhere [14,15]. The mammograms were digitized with an ACS 100 Agfa scanner having a nominal resolution of H u m and a dynamic range of 12 bits.…”

Section: Methodsmentioning

confidence: 99%

“…detection of small object of high contrast) was considered to discriminate centres belonging to the trade-off area and non-optimized centres. Nevertheless, several studies have shown a good correlation between the IQI scores and the subjective image quality assessment [14,18]. To check if the analysis was not test object related, the results of Figure 2 were plotted with the type of test object regularly used locally (see Figure 5).…”

Section: Image Quality and Dosementioning

confidence: 99%

Survey on image quality and dose levels used in Europe for mammography

Moeckli²,

Jf³

et al. 1996

The British Journal of Radiology

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Quality assurance programmes are becoming a common practice in the field of mammography. At the present time several recommendations exist and different test objects are used to optimize this radiological procedure. The goal of this study was to check if geographically distant centres using different quality control procedures were comparable when using a common objective way of assessing image quality. The results show that consensus still needs to be found among radiologists to reach a satisfactory level of harmony between patient doses and image quality in Europe.

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“…Some examples are given in the following paragraphs. Hessler et al (1985) have defined an image quality index (IQI) for film-screen systems as the diameter of the smallest visible object with a high probability of correct decision. This index depends on the three quantities, which have been described in Sects.…”

Section: Other Image-quality Figuresmentioning

confidence: 99%