2020年5月18日 · Understanding percentage depth doses (PDDs) for photons and electrons is essential learning for FRCR candidates. Trainees often perform poorly on questions containing simple calculations. This editorial aims to demystify such calculations and increase confidence in attempting these questions. Figure 1 a shows the PDD for two energies, 6 and 15 MV.

PDD curves of 6 MV, 6 MV FFF, 10 MV, 10 MV FFF, and 18 MV photon beams of a 10 × 10 cm 2 field at 100 cm SSD. [...] The purpose of this study is to report the dosimetric aspects of...

The International Atomic Energy Agency Technical Reports Series-398 code of practice for dosimetry recommends measuring photon percentage depth dose (PDD) curves with parallel-plate chambers. This code of practice was published before flattening filter-free (FFF) beams were widely used in clinical linear accelerators.

2022年1月6日 · This study presents an empirical method to model the high-energy photon beam percent depth dose (PDD) curve by using the home-generated buildup function and tail function (buildup-tail function) in radiation therapy.

2017年7月1日 · This work aims to compare and evaluate the dosimetric properties of 6 MV flattening (FF) and flattening filter free (FFF) photon beams which generated from a Varian 2100 medical accelerator. These properties include percentage depth dose, dose rate, beam profile, out-of-field, energy spectra, scatter factor, and surface dose.

2022年1月6日 · Introduction: This study presents an empirical method to model the high-energy photon beam percent depth dose (PDD) curve by using the home-generated buildup function and tail function (buildup-tail function) in radiation therapy. The modeling parameters n and μ of buildup-tail function can be used to characterize the Collimator Scatter Factor ...

In this work, we have studied and examined the dosimetry quality by considering the whole PDD variation. The PDD rate is therefore introduced to determine accurately the quality as an overall notion in external beam radiotherapy according to the field size and photon beam energy.

PDD analyze results indicate the effective dose received at a depth ranging from 13,8 to 15,8 cm for the X-Ray beam to beam 6 and 10 MV ranges at a depth of 21,8 to 23,8 cm, with a deviation measurements classified small ie 0 to 0,3%.

dose (PDD) merupakan perbandingan antara dosis radiasi pada satu kedalaman dan dosis maksimum di kedalaman maksimum. Nilai PDD dipengaruhi oleh jenis berkas dan energi radiasi, teknik penyinaran yang dilakukan source to surface distance (SSD) atau source to axial distance (SAD), luas lapangan penyinaran, dan kedalaman.

Penelitian dilakukan dengan mengukur dan membandingkan metode PDD dan TPR untuk menentukan indek kualitas berkas pada pesawat linac energi foton 6 MV dan 10 MV.