Detection of electron beam energy variations using a computed radiography system.

Journal of Applied Clinical Medical Physics
Yang C CaiJames C H Chu

Abstract

A method to evaluate the electron beam energy constancy by employing the computed radiography (CR) system has been developed. In this method, a right triangular plastic wedge is used to produce a curve of the CR storage phosphor plate signal versus the wedge thickness. The curve, which resembles the percentage depth ionization curve of the clinical electron beams, can be used to derive the energy constancy metric EC(50). The sensitivity of the method was tested using polystyrene sheets of variable thicknesses. For electron energies up to 12 MeV, energy changes induced by 1.5 mm thick polystyrene can be detected, while a 2.3 mm thick polystyrene sheet is required for higher energies. The measurements were carried out over a two-year period. The results showed a good reproducibility with the use of the same CR plate and cassette, and without the requirement of calibration procedures. The two-year range of the EC(50) was within the 99% confidence intervals, and the standard deviation of the EC(50) was measured to be from 0.3 to 0.4 mm for different beam energies. This technique provides an efficient and accurate method to perform the electron beam energy check and could be used by centers equipped with the CR system without requir...Continue Reading

References

Dec 1, 1989·International Journal of Radiation Oncology, Biology, Physics·D GurM S Rosenthal
Oct 25, 2001·Journal of Applied Clinical Medical Physics·R P King, R S Anderson
Jul 5, 2003·Journal of Applied Clinical Medical Physics·Derek M WellsWill Ansbacher

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Citations

Apr 14, 2016·Journal of Applied Clinical Medical Physics·Juergen MeyerGeorge A Sandison

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