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Voltage waveform effects on output and penetration of W- and Mo-anode mammographic tubes.

Publication ,  Journal Article
O'Foghludha, F; Johnson, GA
Published in: Phys Med Biol
March 1981

The output and half-value thickness (HVT) for arbitrary voltage waveforms can be calculated if the variation of both quantities with voltage is known under constant-potential (ripple-free) conditions. An apparatus to study this variation is described. It permits measurements of output and HVT with a Si(Li) spectrometer under conditions equivalent to constant-potential operation; it uses mechanical or electronic gating to limit observations to constant-potential operation; it uses mechanical or electronic gating to limit observations to short periods near the peaks of a sinusoidal waveform. For W anodes both HVT and output are found to follow simple power laws, while polynomial functions of voltage are needed for Mo anodes. Calculations based on these data agree well with experiments in which various ripples are simulated by altering the gating interval. For Mo anodes, the output increases as the ripple decreases, but the HVT changes very little. For W anodes both quantities decrease when the ripple increases. The implications in mammography are briefly discussed.

Duke Scholars

Published In

Phys Med Biol

DOI

ISSN

0031-9155

Publication Date

March 1981

Volume

26

Issue

2

Start / End Page

291 / 303

Location

England

Related Subject Headings

  • Tungsten
  • Nuclear Medicine & Medical Imaging
  • Molybdenum
  • Mammography
  • Humans
  • Female
  • Electrodes
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering
 

Citation

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O’Foghludha, F., & Johnson, G. A. (1981). Voltage waveform effects on output and penetration of W- and Mo-anode mammographic tubes. Phys Med Biol, 26(2), 291–303. https://doi.org/10.1088/0031-9155/26/2/008
O’Foghludha, F., and G. A. Johnson. “Voltage waveform effects on output and penetration of W- and Mo-anode mammographic tubes.Phys Med Biol 26, no. 2 (March 1981): 291–303. https://doi.org/10.1088/0031-9155/26/2/008.
O’Foghludha F, Johnson GA. Voltage waveform effects on output and penetration of W- and Mo-anode mammographic tubes. Phys Med Biol. 1981 Mar;26(2):291–303.
O’Foghludha, F., and G. A. Johnson. “Voltage waveform effects on output and penetration of W- and Mo-anode mammographic tubes.Phys Med Biol, vol. 26, no. 2, Mar. 1981, pp. 291–303. Pubmed, doi:10.1088/0031-9155/26/2/008.
O’Foghludha F, Johnson GA. Voltage waveform effects on output and penetration of W- and Mo-anode mammographic tubes. Phys Med Biol. 1981 Mar;26(2):291–303.
Journal cover image

Published In

Phys Med Biol

DOI

ISSN

0031-9155

Publication Date

March 1981

Volume

26

Issue

2

Start / End Page

291 / 303

Location

England

Related Subject Headings

  • Tungsten
  • Nuclear Medicine & Medical Imaging
  • Molybdenum
  • Mammography
  • Humans
  • Female
  • Electrodes
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering