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Usefulness of a small-field digital mammographic imaging system using parabolic polycapillary optics as a diagnostic imaging tool: a preliminary study.

Chon KS, Park JG, Son HH, Kang SH, Park SH, Kim HW, Kim HS, Yoon KH - Korean J Radiol (2009 Nov-Dec)

Bottom Line: A larger field image greater than 10 mm in diameter could be obtained by scanning an object.On the small-field mammographic imaging system, microcalcifications of breast cancer tissue were clearly observed.A small-field digital mammographic imaging system with parabolic polycapillary optics may be a useful diagnostic tool for providing high-resolution imaging with a low radiation dose for examination of local volumes of breast tissue.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiological Science, Catholic University of Daegu, Gyeongbuk 712-702, Korea.

ABSTRACT

Objective: To evaluate the efficacy for spatial resolution and radiation dose of a small-field digital mammographic imaging system using parabolic polycapillary optics.

Materials and methods: We developed a small-field digital mammographic imaging system composed of a CCD (charge coupled device) detector and an X-ray source coupled with parabolic polycapillary optics. The spatial resolution and radiation dose according to various filters were evaluated for a small-field digital mammographic imaging system. The images of a test standard phantom and breast cancer tissue sample were obtained.

Results: The small-field digital mammographic imaging system had spatial resolutions of 12 lp/mm with molybdenum and rhodium filters with a 25-microm thickness. With a thicker molybdenum filter (100 microm thick), the system had a higher spatial resolution of 11 lp/mm and contrast of 0.48. The radiation dose for a rhodium filter with a 25-microm thickness was 0.13 mGy within a 10-mm-diameter local field. A larger field image greater than 10 mm in diameter could be obtained by scanning an object. On the small-field mammographic imaging system, microcalcifications of breast cancer tissue were clearly observed.

Conclusion: A small-field digital mammographic imaging system with parabolic polycapillary optics may be a useful diagnostic tool for providing high-resolution imaging with a low radiation dose for examination of local volumes of breast tissue.

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Related in: MedlinePlus

X-ray spectra after passing through molybdenum (Mo) and rhodium (Rh) filters with 25 µm thickness.
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Figure 6: X-ray spectra after passing through molybdenum (Mo) and rhodium (Rh) filters with 25 µm thickness.

Mentions: Additionally, the molybdenum and rhodium filters remarkably reduced the low energy of the X-ray beam which passed through the parabolic polycapillary optics removing the high energy larger than 20 keV of the generated X-rays because the critical angles for the high energy X-rays were smaller than that for molybdenum radiation. Because of the parabolic polycapillary optics and the filter, the radiation doses were remarkably reduced, and the fact that the rhodium filter allowed a lower radiation dose could be verified by measuring the energy spectra shown in Figure 6. Within the overall energy region, the number of photons for the rhodium filter was lower than that for the molybdenum filter.


Usefulness of a small-field digital mammographic imaging system using parabolic polycapillary optics as a diagnostic imaging tool: a preliminary study.

Chon KS, Park JG, Son HH, Kang SH, Park SH, Kim HW, Kim HS, Yoon KH - Korean J Radiol (2009 Nov-Dec)

X-ray spectra after passing through molybdenum (Mo) and rhodium (Rh) filters with 25 µm thickness.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2770826&req=5

Figure 6: X-ray spectra after passing through molybdenum (Mo) and rhodium (Rh) filters with 25 µm thickness.
Mentions: Additionally, the molybdenum and rhodium filters remarkably reduced the low energy of the X-ray beam which passed through the parabolic polycapillary optics removing the high energy larger than 20 keV of the generated X-rays because the critical angles for the high energy X-rays were smaller than that for molybdenum radiation. Because of the parabolic polycapillary optics and the filter, the radiation doses were remarkably reduced, and the fact that the rhodium filter allowed a lower radiation dose could be verified by measuring the energy spectra shown in Figure 6. Within the overall energy region, the number of photons for the rhodium filter was lower than that for the molybdenum filter.

Bottom Line: A larger field image greater than 10 mm in diameter could be obtained by scanning an object.On the small-field mammographic imaging system, microcalcifications of breast cancer tissue were clearly observed.A small-field digital mammographic imaging system with parabolic polycapillary optics may be a useful diagnostic tool for providing high-resolution imaging with a low radiation dose for examination of local volumes of breast tissue.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiological Science, Catholic University of Daegu, Gyeongbuk 712-702, Korea.

ABSTRACT

Objective: To evaluate the efficacy for spatial resolution and radiation dose of a small-field digital mammographic imaging system using parabolic polycapillary optics.

Materials and methods: We developed a small-field digital mammographic imaging system composed of a CCD (charge coupled device) detector and an X-ray source coupled with parabolic polycapillary optics. The spatial resolution and radiation dose according to various filters were evaluated for a small-field digital mammographic imaging system. The images of a test standard phantom and breast cancer tissue sample were obtained.

Results: The small-field digital mammographic imaging system had spatial resolutions of 12 lp/mm with molybdenum and rhodium filters with a 25-microm thickness. With a thicker molybdenum filter (100 microm thick), the system had a higher spatial resolution of 11 lp/mm and contrast of 0.48. The radiation dose for a rhodium filter with a 25-microm thickness was 0.13 mGy within a 10-mm-diameter local field. A larger field image greater than 10 mm in diameter could be obtained by scanning an object. On the small-field mammographic imaging system, microcalcifications of breast cancer tissue were clearly observed.

Conclusion: A small-field digital mammographic imaging system with parabolic polycapillary optics may be a useful diagnostic tool for providing high-resolution imaging with a low radiation dose for examination of local volumes of breast tissue.

Show MeSH
Related in: MedlinePlus