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Comparison of compact gamma cameras with 1.3- And 2.0-mm quantized elements for dedicated emission mammotomography

Publication ,  Journal Article
Tornai, MP; Brzymialkiewicz, CN; Bradshaw, ML; Bowsher, JE; Patt, BE; Iwanczyk, JS; Li, J; MacDonald, LR
Published in: IEEE Transactions on Nuclear Science
October 1, 2005

In an effort to image smaller breast lesions, two compact gamma cameras with different intrinsic Nal(Tl) pixel sizes are evaluated for use in the application specific emission tomography (ASET) system for dedicated mammotomographic emission imaging. Comparison measurements were made with two scintillator arrays having 1.3 × 1.3 × 6 mm 3 or 2.0 × 2.0 × 6 mm 3 elements on exactly the same set of PMTs, electronics and control/processing hardware. Uniformity, sensitivity and energy resolution were assessed with flood field phantoms. Spatial resolution measurements included: a 99mTc (140 keV) activity filled capillary tube imaged in planar mode from 1-10 cm distance; two such tubes separated by 2 cm were also imaged with simple circular tomography from 3-7 cm radii-of-rotation (RORs); and a 99m Tc filled mini cold-rod phantom was imaged at 5 cm ROR with a simple circular orbit. Finally, a freely suspended and uniformly filled 950 mL breast phantom containing four tillable lesions (4-10 mm dia) was imaged with a lesion-to-uniform-background activity concentration ratio of 15:1, using simple and complex three-dimensional (3-D) orbits and minimal RORs. The measured sensitivity varied by the crystal fill-factor; uniformity had <4% variability; and mean energy resolutions of each camera were <12% full-width at half-maximum (FWHM). The planar spatial resolutions correspond to calculated values, with smaller pixels yielding 2%-13% better resolution with decreasing separation distance; tomographic results ranged from 3.2-5.2 mm FWHM at 3-7 cm, with nominally better contrast-resolution for the smaller pixel camera. Consistent with signal detection characteristics for these measurement conditions, quantitative SNRs and contrasts from lesion imaging with the uniform breast background illustrate better overall performance under nearly all conditions and for all lesions for the larger pixel camera. © 2005 IEEE.

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Published In

IEEE Transactions on Nuclear Science

DOI

ISSN

0018-9499

Publication Date

October 1, 2005

Volume

52

Issue

5 I

Start / End Page

1251 / 1256

Related Subject Headings

  • Nuclear & Particles Physics
  • 5106 Nuclear and plasma physics
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

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Tornai, M. P., Brzymialkiewicz, C. N., Bradshaw, M. L., Bowsher, J. E., Patt, B. E., Iwanczyk, J. S., … MacDonald, L. R. (2005). Comparison of compact gamma cameras with 1.3- And 2.0-mm quantized elements for dedicated emission mammotomography. IEEE Transactions on Nuclear Science, 52(5 I), 1251–1256. https://doi.org/10.1109/TNS.2005.858192
Tornai, M. P., C. N. Brzymialkiewicz, M. L. Bradshaw, J. E. Bowsher, B. E. Patt, J. S. Iwanczyk, J. Li, and L. R. MacDonald. “Comparison of compact gamma cameras with 1.3- And 2.0-mm quantized elements for dedicated emission mammotomography.” IEEE Transactions on Nuclear Science 52, no. 5 I (October 1, 2005): 1251–56. https://doi.org/10.1109/TNS.2005.858192.
Tornai MP, Brzymialkiewicz CN, Bradshaw ML, Bowsher JE, Patt BE, Iwanczyk JS, et al. Comparison of compact gamma cameras with 1.3- And 2.0-mm quantized elements for dedicated emission mammotomography. IEEE Transactions on Nuclear Science. 2005 Oct 1;52(5 I):1251–6.
Tornai, M. P., et al. “Comparison of compact gamma cameras with 1.3- And 2.0-mm quantized elements for dedicated emission mammotomography.” IEEE Transactions on Nuclear Science, vol. 52, no. 5 I, Oct. 2005, pp. 1251–56. Scopus, doi:10.1109/TNS.2005.858192.
Tornai MP, Brzymialkiewicz CN, Bradshaw ML, Bowsher JE, Patt BE, Iwanczyk JS, Li J, MacDonald LR. Comparison of compact gamma cameras with 1.3- And 2.0-mm quantized elements for dedicated emission mammotomography. IEEE Transactions on Nuclear Science. 2005 Oct 1;52(5 I):1251–1256.

Published In

IEEE Transactions on Nuclear Science

DOI

ISSN

0018-9499

Publication Date

October 1, 2005

Volume

52

Issue

5 I

Start / End Page

1251 / 1256

Related Subject Headings

  • Nuclear & Particles Physics
  • 5106 Nuclear and plasma physics
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics