Erratum: "AAPM protocol for 40-300 kV x-ray beam dosimetry in radiotherapy and radiobiology".

Abstract

Medical PhysicsEarly View ERRATUMFree Access Erratum: “AAPM protocol for 40–300 kV x-ray beam dosimetry in radiotherapy and radiobiology” This article corrects the following: AAPM protocol for 40–300 kV x-ray beam dosimetry in radiotherapy and radiobiology C.-M. Ma, C. W. Coffey, L. A. DeWerd, C. Liu, R. Nath, S. M. Seltzer, J. P. Seuntjens, Volume 28Issue 6Medical Physics pages: 868-893 First Published online: June 12, 2001 C.-M. Ma (chair), Corresponding Author C.-M. Ma (chair) charlie.ma@fccc.edu Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania, USA Correspondence: Chang Ming Charlie Ma, Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania, USA. Email: charlie.ma@fccc.eduSearch for more papers by this authorC.W. Coffey, C.W. Coffey Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, Tennessee, USASearch for more papers by this authorL.A. DeWerd, L.A. DeWerd Medical Physics, University of Wisconsin, Madison, Wisconsin, USASearch for more papers by this authorC. Liu, C. Liu Department of Radiation Oncology, University of Florida, Gainesville, Florida, USASearch for more papers by this authorR. Nath, R. Nath Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut, USASearch for more papers by this authorS.M. Seltzer, S.M. Seltzer Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USASearch for more papers by this authorJ.P. Seuntjens, J.P. Seuntjens Department of Medical Physics, Princess Margaret Cancer Centre, Toronto, ON, CanadaSearch for more papers by this author C.-M. Ma (chair), Corresponding Author C.-M. Ma (chair) charlie.ma@fccc.edu Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania, USA Correspondence: Chang Ming Charlie Ma, Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania, USA. Email: charlie.ma@fccc.eduSearch for more papers by this authorC.W. Coffey, C.W. Coffey Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, Tennessee, USASearch for more papers by this authorL.A. DeWerd, L.A. DeWerd Medical Physics, University of Wisconsin, Madison, Wisconsin, USASearch for more papers by this authorC. Liu, C. Liu Department of Radiation Oncology, University of Florida, Gainesville, Florida, USASearch for more papers by this authorR. Nath, R. Nath Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut, USASearch for more papers by this authorS.M. Seltzer, S.M. Seltzer Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USASearch for more papers by this authorJ.P. Seuntjens, J.P. Seuntjens Department of Medical Physics, Princess Margaret Cancer Centre, Toronto, ON, CanadaSearch for more papers by this author First published: 03 February 2023 https://doi.org/10.1002/mp.16239AboutSectionsPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat In Ma et al.,1 two typographic errors were found in the printed version of the report. A division symbol was missing in Eq. (2), which shows the relation between the air-kerma calibration factor, NK, and the frequently used exposure calibration factor, NX. The correct equation should be N K = N X W e a i r / 1 − g , $$\begin{equation} {N}_K = {N}_X{\left( {\frac{W}{e}} \right)}_{air}/\left( {1 - g} \right),\end{equation}$$ (2)where (W/e)air is the average energy expended per unit charge of ionization produced in dry air, having the value 33.97 J/C, and (1 − g) corrects for the effect of radiative losses (mainly due to bremsstrahlung emission) by the secondary charged particles, and g is less than 0.1% for photons below 300 keV in air. Eq. (7) was recommended for deriving the end effect, δt, as described by Attix.2 The correct equation for calculating δt should be δ t = M 2 Δ t 1 − M 1 Δ t 2 M 2 − M 1 $$\begin{equation}\delta {\rm{t}} = \frac{{{M}_2\Delta {t}_1 - {M}_1\Delta {t}_2}}{{{M}_2 - {M}_1}}\end{equation}$$ (7)where M1 and M2 are the chamber readings for exposure time Δt1 and Δt2, respectively. Note that δt can either be positive or negative. To ensure the accuracy of the measured end effect, the graphical method shall be used during the machine commissioning and annual QA. The mathematical method may be used for the monthly QA measurement. REFERENCES 1Ma (chair) C-M, Coffey CW, DeWerd LA, et al. AAPM protocol for 40–300 kV x-ray beam dosimetry in radiotherapy and radiobiology. Med Phys. 2001; 28: 868– 893. 2Attix FH. Introduction to Radiological Physics and Radiation Dosimetry ( Wiley, New York, 1986), pp. 358– 360. Early ViewOnline Version of Record before inclusion in an issue ReferencesRelatedInformation