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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

Spectra for X-ray beam passing through parabolic polycapillary optics combined with X-ray tube and for direct X-ray beam without passing through optics (A) and X-ray reflectivity of glass parabolic polycapillary optics for various bounced X-rays at incidence angle of 1.7 mrad (B).
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Figure 5: Spectra for X-ray beam passing through parabolic polycapillary optics combined with X-ray tube and for direct X-ray beam without passing through optics (A) and X-ray reflectivity of glass parabolic polycapillary optics for various bounced X-rays at incidence angle of 1.7 mrad (B).

Mentions: We compared spectra for X-ray beams passing through parabolic polycapillary optics combined with the X-ray tube and direct X-ray beam as shown in Figure 5A. The high energy X-rays larger than 20 keV were almost removed by propagating the parabolic polycapillary optics although low energy X-rays were also reduced simultaneously. The cut-off of the high energy could also be verified by the calculation of the X-ray reflectivity on the inner surface of the parabolic polycapillary optics (16). Figure 5B shows the X-ray reflectivity as a function of X-ray energy at the fixed incidence angle of 1.7 mrad. After two reflections, the high energy X-rays of more than 20 keV were almost removed. The X-ray generated from the X-ray tube could be reflected up to 17 times on the inner surface of the parabolic polycapillary optics. Low energy X-rays have a larger critical angle than that of high energy X-rays, but the reflectivity of the low energy X-rays decrease at a larger incidence angle than its critical angle. Thus, the intensity of low energy X-rays passing through the parabolic polycapillary optics with various incident angles was also reduced as shown in Figure 5A.


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)

Spectra for X-ray beam passing through parabolic polycapillary optics combined with X-ray tube and for direct X-ray beam without passing through optics (A) and X-ray reflectivity of glass parabolic polycapillary optics for various bounced X-rays at incidence angle of 1.7 mrad (B).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Spectra for X-ray beam passing through parabolic polycapillary optics combined with X-ray tube and for direct X-ray beam without passing through optics (A) and X-ray reflectivity of glass parabolic polycapillary optics for various bounced X-rays at incidence angle of 1.7 mrad (B).
Mentions: We compared spectra for X-ray beams passing through parabolic polycapillary optics combined with the X-ray tube and direct X-ray beam as shown in Figure 5A. The high energy X-rays larger than 20 keV were almost removed by propagating the parabolic polycapillary optics although low energy X-rays were also reduced simultaneously. The cut-off of the high energy could also be verified by the calculation of the X-ray reflectivity on the inner surface of the parabolic polycapillary optics (16). Figure 5B shows the X-ray reflectivity as a function of X-ray energy at the fixed incidence angle of 1.7 mrad. After two reflections, the high energy X-rays of more than 20 keV were almost removed. The X-ray generated from the X-ray tube could be reflected up to 17 times on the inner surface of the parabolic polycapillary optics. Low energy X-rays have a larger critical angle than that of high energy X-rays, but the reflectivity of the low energy X-rays decrease at a larger incidence angle than its critical angle. Thus, the intensity of low energy X-rays passing through the parabolic polycapillary optics with various incident angles was also reduced as shown in Figure 5A.

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