Performance evaluation of a “dual‐side read” dedicated mammography computed radiography system

Fetterly, Kenneth A.; Schueler, Beth A.

doi:10.1118/1.1584045

Cited by 48 publications

(43 citation statements)

References 31 publications

(38 reference statements)

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“…Phantom evaluations use a series of standard commercial test objects to look at performance indicators, including resolution vs dose [12,17,33]. Such physical studies can only give an indication of clinical performance, and it is difficult to exactly quantify the contribution made by soft-tissue structures [17].…”

Section: Discussionmentioning

confidence: 99%

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Diagnostic quality of 50 and 100 µm computed radiography compared with screen–film mammography in operative breast specimens

Pagliari

Hoàng²,

Reddy³

et al. 2012

BJR

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Objective: To compare reader ratings of the clinical diagnostic quality of 50 and 100 mm computed radiography (CR) systems with screen-film mammography (SFM) in operative specimens. Methods: Mammograms of 57 fresh operative breast specimens were analysed by 10 readers. Exposures were made with identical position and compression with three mammographic systems (Fuji 100CR, 50CR and SFM). Images were anonymised and readers blinded to the CR system used. A five-point comparative scoring system (22 to +2) was used to assess seven quality criteria and overall diagnostic value. Statistical analysis was subsequently performed of reader ratings (n516 925). Results: For most quality criteria, both CR systems were rated as equivalent to or better than SFM. The CR systems were significantly better at demonstrating skin edge and background tissue (p,1610 25 ). Microcalcification was best demonstrated on the CR50 system (p,1610 25 ). The overall diagnostic value of both CR systems was rated as being as good as or better than SFM (p,1610 25 ). Conclusion: In this clinical setting, the overall diagnostic performance of both CR systems was as good as or better than SFM, with the CR50 system performing better than the CR100. There are currently three technologies widely available for diagnostic mammography: screen-film mammography (SFM) and two forms of large-field digital mammography [1]. The use of the term full-field digital mammography (FFDM) varies in the published literature and has been applied to both computed radiography (CR) and direct digital radiography (DR). Small-field digital mammography (SFDM) is mainly used for imaging during stereotactic biopsy [2].The advantages of digital mammography over SFM include: improved sensitivity in dense breast tissue, reduced radiation dose, the ability to manipulate images for review, and digital storage and retrieval methods [3]. CR was the earliest digital system in use. Imaging cassettes contain a re-useable photostimulable phosphor, replacing the traditional screen-film cassettes, and are then transferred to a laser reader. DR has an in-built detector and reader. Digital mammography has a lower spatial resolution than SFM, but has a very high contrast resolution. This allows the overall resolution of digital mammography to be at least equivalent to SFM [4][5][6][7][8], even when viewing calcification smaller than the pixel size [9]. Some CR systems have not met the quality standards of a number of governing bodies for mammography, including the European Network of Reference Assessment Centres (EUREF) and the NHS Breast Screening Programme (NHSBSP) [10,11]. This is related to the resolution achievable with 100 mm cassettes [12]. It is now known that CR systems using 50 mm cassettes can provide improved resolution, at an acceptable mean glandular dose, and have been approved for screening by the NHSBSP [13][14][15].Phantom studies indicate that the resolution and performance of DR are greater than those of CR [16,17], but have limitations. Although there are many clini...

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Section: Discussionmentioning

confidence: 99%

“…Many now have dual-sided imaging plates and readers, tuned to high resolution and low noise [33], with a smaller laser spot size of 50 mm or less [34]. Newer developments include needle crystal technology to reduce light spread and improve image sharpness [35], which is already used in general radiography.…”

Section: Discussionmentioning

confidence: 99%

Diagnostic quality of 50 and 100 µm computed radiography compared with screen–film mammography in operative breast specimens

Pagliari

Hoàng²,

Reddy³

et al. 2012

BJR

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“…In mammography, a high-resolution computed radiography (CR) system with a pixel size of 0.05 9 0.05 mm, including a transparent imaging plate (IP) and a dual-sided reader, has been developed and widely used [6,7]. To our knowledge, however, there have been no published data on image quality measurements and the detectability of subtle microcalcifications on magnification mammography with the CR system, performed under identical incident exposure conditions.…”

Section: Introductionmentioning

confidence: 99%

Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications

Tanaka

Naka

Fukushima

et al. 2011

Radiol Phys Technol

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Our purpose was to evaluate the usefulness of digital magnification mammography with matched incident exposure by investigating the physical imaging properties and doing an observer performance test. A computed radiography system and a mammographic unit were used in this study. Contact and magnification radiographies of 1.2-1.8 in combination with focal spot sizes of 0.1 mm without grid and 0.3 mm with grid were performed. Physical imaging properties, namely, scatter fraction, total modulation transfer function (MTF) including the presampled MTF and the MTF of focal spot size, and Wiener spectrum (WS), were measured. Detail visibility was evaluated by use of free-response receiver operating characteristic analysis of the detectability of simulated microcalcifications. Scatter fractions decreased considerably as the magnification factor increased without grid technique. In the grid technique, scatter fractions for all magnification techniques were comparable. The total MTFs of magnification techniques with a focal spot size of 0.1 mm improved significantly compared with the conventional contact technique. However, the improvement of the total MTFs of magnification techniques with the combination of 0.3 mm focal spot size was small. The WSs degraded with an increase of the magnification factor compared with the contact technique due to the maintained exposure incident on the object. The observer performance test indicated that the 1.8 magnification technique with the 0.1 mm focal spot size provided higher detectability than did the contact technique. Digital magnification mammography under the same incident exposure conditions improved the detectability of microcalcifications.

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“…Detection of subtle lesions buried under anatomic structures such as the mammary gland requires high image quality and experienced observers [8]. Performance of imaging systems is usually assessed [4] by image readings by radiologists and radiographers with different image-reading characteristics and capabilities.…”

Section: Introductionmentioning

confidence: 99%

“…CR systems with a pixel size of 50 lm, transparent imaging plates, and a dual-sided reader have been developed [2,3], and have realized high spatial and contrast resolutions. These remarkable improvements make it possible to depict tiny and subtle lesions [4,5].…”

Section: Introductionmentioning

confidence: 99%

Quantification of image quality using information theory

Niimi

Maeda

Ikeda

et al. 2011

Australas Phys Eng Sci Med

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Aims of present study were to examine usefulness of information theory in visual assessment of image quality. We applied first order approximation of the Shannon's information theory to compute information losses (IL). Images of a contrast-detail mammography (CDMAM) phantom were acquired with computed radiographies for various radiation doses. Information content was defined as the entropy Σp( i )log(1/p ( i )), in which detection probabilities p ( i ) were calculated from distribution of detection rate of the CDMAM. IL was defined as the difference between information content and information obtained. IL decreased with increases in the disk diameters (P < 0.0001, ANOVA) and in the radiation doses (P < 0.002, F-test). Sums of IL, which we call total information losses (TIL), were closely correlated with the image quality figures (r = 0.985). TIL was dependent on the distribution of image reading ability of each examinee, even when average reading ratio was the same in the group. TIL was shown to be sensitive to the observers' distribution of image readings and was expected to improve the evaluation of image quality.

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Performance evaluation of a “dual‐side read” dedicated mammography computed radiography system

Cited by 48 publications

References 31 publications

Diagnostic quality of 50 and 100 µm computed radiography compared with screen–film mammography in operative breast specimens

Diagnostic quality of 50 and 100 µm computed radiography compared with screen–film mammography in operative breast specimens

Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications

Quantification of image quality using information theory

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