Focal spot size definition

Focal spot size means the area of the target or anode that is bombarded by electrons from the cathode of the X-ray tube to produce X-rays. The smaller the focal spot, the better the limited spatial resolution of the X-ray system, especially in magnification mammography.
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Examples of Focal spot size in a sentence

  • Constant potential minimum 20 KHz frequency.3. Exposure timer of minimum 0.02 to 2 seconds.4. Focal spot size should not exceed 0.8 X 0.8 mm5.

  • Focal spot size: pinhole method To determine the focal spot dimensions (f) with a pinhole, a µ30 m gold/platinum alloy pinhole is used.

  • Focal spot size of the tapered objective was also measured and, as a result, 1/e2 spot size of ~1.36 μm was obtained.

  • Assessment of the Focal spot size and the X-ray/Light beam alignment.

  • Laser parameters such as Wavelength (nm) Exposure time (ns sec) Applied energy (j) Focal spot size (cm² – m² “A=πr2) Energy density (j/cm²) Power density (W/cm²) W= j/sec Staining (sensitization) of biological tissue, which contributes on diagnostic purposes and selective photo destruction of individual components; and for photodynamic therapy (Niemz.,1996).As well be described next.# Exposure time is a very crucial parameter when selecting a certain type of interaction.

  • At 2X magnification d1 equals d2 and equation(3) becomes: Focal spot size = 1/fi ...eqn(4) In absence of a distinct zero on MTF curve the frequency of the first minima gives satisfactory result.

  • This shall be applicable for both 9MeV and 5MeV modes.(f) X-ray beam focal spot size Focal spot size shall be 2 mm or less diameter for both 5 MeV and 9 MeV energies and qualified according to EN 12543-2 or equivalent standards.(g) Radiographic Quality The Linac system shall demonstrate a radiographic image quality level of 1-2T or better sensitivity as per in ASTM E142 and ASTM E94-4 in steel of following thickness ranges.

  • RADIOGRAPHIC TECHNIQUE: Focal spot size (FSS) SelectionGiven a minimum amount of voluntary/involuntary patient motion, etc., the student will be able to select the appropriate focal spot as to provide for a maximum amount of image clarity (sharpness of detail or definition) in the production of a diagnostically acceptable radiograph(s) with above average achievement*.

  • Focal spot size is one factor that must be considered when selecting an x-ray tube for a specific application.

  • The Aged Accounts Receivable schedule indicates that of the$12,167.17 due from current residents, $8,374.44 (68.83%) is in the range of 0-30 days delinquent.

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