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

Fr, Verdun; Moeckli, Raphaël; Jf, Valley; Bochud, François; Hessler, C

doi:10.1259/0007-1285-69-824-762

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…The image quality assessment is a significant factor in the decision to accredit a facility. In this context, several groups have developed automated methods to objectively score test phantom images (ACR (Chakraborty and Eckert 1995), TORMAX (Castellano et al 1998), IQI test phantom (Verdun et al 1996) and CDMAM (Karssemeijer et al 1995, Veldkamp andKarssemeijer 1998)). For each test phantom, the automated method gives scores comparable with, but more consistent than, human observer scores.…”

Section: Introductionmentioning

confidence: 99%

A new test phantom with different breast tissue compositions for image quality assessment in conventional and digital mammography

Pachoud¹,

Lepori

Valley³

et al. 2004

Phys. Med. Biol.

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Our objective is to describe a new test phantom that permits the objective assessment of image quality in conventional and digital mammography for different types of breast tissue. A test phantom, designed to represent a compressed breast, was made from tissue equivalent materials. Three separate regions, with different breast tissue compositions, are used to evaluate low and high contrast resolution, spatial resolution and image noise. The phantom was imaged over a range of kV using a Contour 2000 (Bennett) mammography unit with a Kodak MinR 2190-MinR L screen-film combination and a Senograph 2000D (General Electric) digital mammography unit. Objective image quality assessments for different breast tissue compositions were performed using the phantom for conventional and digital mammography. For a similar mean glandular dose (MGD), the digital system gives a significantly higher contrast-to-noise ratio (CNR) than the screen-film system for 100% glandular tissue. In conclusion, in mammography, a range of exposure conditions is used for imaging because of the different breast tissue compositions encountered clinically. Ideally, the patient dose-image quality relationship should be optimized over the range of exposure conditions. The test phantom presented in this work permits image quality parameters to be evaluated objectively for three different types of breast tissue. Thus, it is a useful tool for optimizing the patient dose-image quality relationship.

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Section: Introductionmentioning

confidence: 99%

A new test phantom with different breast tissue compositions for image quality assessment in conventional and digital mammography

Pachoud¹,

Lepori

Valley³

et al. 2004

Phys. Med. Biol.

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“…A good correlation between the IQI and radiologists' ranking has been observed in a comparative study of mammographic screen-film systems (Hessler et al 1985). It has been successfully used in a study on the influence of anode-filtration combinations (Desponds et al 1991b) and in an image quality and dose study in Europe (Verdun et al 1996).…”

Section: Image Quality Assessmentmentioning

confidence: 92%

Objective comparison of image quality and dose between conventional and synchrotron radiation mammography

Moeckli¹,

Verdun²,

Fiedler

et al. 2000

Phys. Med. Biol.

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The shape of the energy spectrum produced by an x-ray tube has a great importance in mammography. Many anode-filtration combinations have been proposed to obtain the most effective spectrum shape for the image quality-dose relationship. On the other hand, third generation synchrotrons such as the European Synchrotron Radiation Facility in Grenoble are able to produce a high flux of monoenergetic radiation. It is thus a powerful tool to study the effect of beam energy on image quality and dose in mammography. An objective method was used to evaluate image quality and dose in mammography with synchrotron radiation and to compare them to standard conventional units. It was performed systematically in the energy range of interest for mammography through the evaluation of a global image quality index and through the measurement of the mean glandular dose. Compared to conventional mammography units, synchrotron radiation shows a great improvement of the image quality-dose relationship, which is due to the beam monochromaticity and to the high intrinsic collimation of the beam, which allows the use of a slit instead of an anti-scatter grid for scatter rejection.

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“…This approach was later completed with large scale patient dose studies [12 • ]. Many countries have studied their patient doses too now, and established local DRLs [36,[39][40][41][42]. This happened especially in the frame of screening programmes.…”

Section: Diagnostic Reference Levels In Mammography and Large Scale Dmentioning

confidence: 99%

Radiation Doses and Risks Associated with Mammographic Screening

Bosmans

Marshall

2013

Curr Radiol Rep

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Radiation dose and the associated risk to the breast are being studied in much detail with the aim of justifying breast cancer screening. The mean glandular dose has been proposed as the proper quantity to describe risks incurred by radiation. X. Wu (US) and D. Dance (UK) were the first authors to standardize breast dosimetry and their conversion tables have been used throughout. Doses can be calculated for specific population samples or for individual patients, in which case an accurate estimate of the glandular tissue fraction should be known. From specific DICOM tags in the digital images and access to tube output measurements from the medical physics QA, patient dose assessment can be largely automated. Other (traditional) approaches mimic clinical exposures on a Perspex phantom and use these exposures to estimate the breast dose to a typical breast. Any local data, both patient dose data and doses to Perspex, can these days be compared to an extensive amount of published dose values. Radiation dose and image quality should both be considered in screening applications. Better image quality can have a significant effect on diagnostic performance. As only a small increase in performance (ex. detected fraction) gained can mean an enormous amount of women saved, image quality settings should be optimized and not minimized. Risk benefit investigation should therefore focus on performance rather than dose. For a few screening programs, the benefits could be proven. Emerging technologies should be investigated along the same basic principles.

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

Cited by 9 publications

References 9 publications

A new test phantom with different breast tissue compositions for image quality assessment in conventional and digital mammography

A new test phantom with different breast tissue compositions for image quality assessment in conventional and digital mammography

Objective comparison of image quality and dose between conventional and synchrotron radiation mammography

Radiation Doses and Risks Associated with Mammographic Screening

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