Advanced digital mammography system based on phase contrast technology

Gido, Tomonori; Nagatsuka, Sumiya; Amitani, Kouji; Yonekawa, Hisashi; Shimoji, Masaya; Honda, Chika

doi:10.1117/12.594972

Cited by 7 publications

(13 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure 83, the experimental results of the image quality for a demagnified image from xl.75 magnification are shown for (a) presampling MTF and (b) NPS in solid lines compared to conventional contact digital imaging in dotted lines (Gido et al, 2005). The calculated NEQ results with Eq.…”

Section: Neq(u) = Mtfz(u)/nps(u)mentioning

confidence: 97%

“…The magnified PCM images on a CR storage phosphor plate are scanned at a sampling rate of 43.75 Bm and then reduced to the original object size with 25 Bm pixels for printing on photothermographic film (Gido et al, 2005). The image qualities of the full-field digital PCM system achieved are equivalent to or better than those of conventional S/F mammography.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Full-field Digital Phase-contrast Mammography

Tanaka¹,

Honda²,

Matsuo³

et al. 2008

Cancer Imaging

Self Cite

View full text Add to dashboard Cite

Section: Neq(u) = Mtfz(u)/nps(u)mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Full-field Digital Phase-contrast Mammography

Tanaka¹,

Honda²,

Matsuo³

et al. 2008

Cancer Imaging

Self Cite

View full text Add to dashboard Cite

“…A PCM (phase contrast mammography) is the mammography system developed in order to depict the phase contrast using practical X-ray tube. It was reported that the edges of the objects in the PCM images were enhanced, and that sharpness of the images was improved compared with that of a conventional mammography images [1][2][3] . It was said that the phenomenon of the edge enhancement was based on refraction of X rays [1][2][3][4] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of physical image characteristics of phase contrast mammography

2007

View full text Add to dashboard Cite

Recently, the system called PCM (phase contrast mammography) came to be applied to clinical examinations. The PCM images are acquired as 1.75x-magnified images using small focal spot, then reduced to real object's size by image processing. The PCM images had the feature that edges of objects were enhanced. It was reported that the edges were enhanced because of refraction of X rays. We measured physical image characteristics of the PCM, to compare image characteristics of the PCM with those of a conventional mammography. Specifically, response characteristics to objects and noise characteristics in the spatial frequency domain were measured. As the results, compared with the conventional mammography, response characteristics of the PCM were high. If the placement conditions of objects were changed, response characteristics were also changed. And if the shape of objects was changed, response characteristics also were changed. Noise characteristics of the PCM were better than those of the conventional mammography. Furthermore, in order to investigate why edges of objects in the PCM images were enhanced, we simulated image profiles which would be obtained if X rays were refracted. And, we found the possibility that edge enhancements of the PCM images were based on refraction of X rays.

show abstract

“…Yamazaki et al [13] studied the MTF and digital WS of a PCM system, calculated the response function from image profile curves, and compared with those of conventional imaging. However, the phase effect derived from refracted X-rays was not discussed sufficiently in these reports because they used simple objects (metallic plates or simple acrylic objects) for measurement, which were different from actual images [12,13]. Kuhis-Gilcrist et al [14] introduced a new technique to determine the system pre-sampled MTF in digital radiography using only the WS, although calculation of the MTF, including the phase effect, is not possible.…”

mentioning

confidence: 98%

“…Kotre et al [11] reported visual evaluation of mammographic images of a TORMAM image-quality phantom using three imaging methods, i.e., conventional contact imaging (conventional imaging), magnified imaging (magnification imaging), and digital phase-contrast imaging (phase imaging). Gido et al [12] measured the modulation transfer function (MTF), Wiener spectrum (WS) (noise power spectrum), and noise-equivalent quanta (NEQ) of a phasecontrast mammography (PCM) system. Yamazaki et al [13] studied the MTF and digital WS of a PCM system, calculated the response function from image profile curves, and compared with those of conventional imaging.…”

mentioning

confidence: 99%

Image-quality assessment method for digital phase-contrast imaging based on two-dimensional power spectral analysis

Matsuo

Morishita

Katafuchi

et al. 2011

Radiol Phys Technol

Self Cite

View full text Add to dashboard Cite

With use of the phase shift of X-rays that occurs when they pass through an object, phase-contrast imaging (herein referred to as "phase imaging") can produce images different from those of conventional contact imaging (herein referred to as "conventional imaging"). For this reason, assessment of the image quality based on noise-equivalent quanta (NEQ) and detective quantum efficiency (DQE) which does not include object-based information may not be appropriate for comparison of image quality between phase and conventional images. As an alternative method, we conceived a new image-quality assessment method with images that contain information about an object. First, we constructed images with an object and without an object under the same imaging parameters; then, we obtained two-dimensional power spectra by Fourier transform of those images. Second, we calculated the radial direction distribution function with the power spectra, and the distribution of signal intensity, which we defined as a signal intensity distribution function (SIDF). In this way, differences in image quality were evaluated relatively based on the SIDF of the imaged object. In our study, we first confirmed that phase-imaging evaluation was not appropriate by comparing NEQ and DQE of conventional, magnification, and phase imaging. Further, comparing the image quality of projected plant seeds by employing conventional, magnification, and phase imaging, we found that the phase-imaging method provided a higher image quality regarding edge sharpness than did conventional and magnification imaging. Therefore, based on these results, our image assessment method is considered useful for evaluation of images which include object-based information.

show abstract

Advanced digital mammography system based on phase contrast technology

Cited by 7 publications

References 10 publications

Full-field Digital Phase-contrast Mammography

Full-field Digital Phase-contrast Mammography

Evaluation of physical image characteristics of phase contrast mammography

Image-quality assessment method for digital phase-contrast imaging based on two-dimensional power spectral analysis

Contact Info

Product

Resources

About