Combining tissue‐phantom ratios to provide a beam‐quality specifier for flattening filter free photon beams

Dalaryd, Mårten; Knöös, Tommy; Ceberg, Crister

doi:10.1118/1.4898325

Cited by 21 publications

(23 citation statements)

References 26 publications

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“…The highest change in the relationship was determined for the highest linear accelerator energy with 18 MV x‐rays. However, our results, for the WFF as well as for the FFF linacs with the nominal energy of 6 MV, are consistent with the findings by Dalaryd et al . Dalaryd et al .…”

Section: Resultssupporting

confidence: 93%

“…As can be seen, the calculated data are in good agreement with data published by Dalaryd et al . For comparison, the fits recommended by the dosimetry protocols from the IAEA and AAPM are added.…”

Section: Resultssupporting

confidence: 82%

“…The fits through all FFF dat calculated in this work are represented by a red dashed line. The values are compared with the data calculated by Dalaryd et al., while the gray lines represent the fit from the dosimetry protocols, respectively. Error bars represent one standard deviation of Monte Carlo statistical uncertainty (i.e., σ < 0.1%).…”

Section: Resultsmentioning

confidence: 99%

“…Several Monte Carlo‐based studies investigated the relationship between %dd(10) x and TPR

_{10}^{20}

, respectively, and

{false(\overset{L}{true} false/ italicρ false)}_{air}^{water}

for realistic radiation fields with (WFF) and without flattening filter (FFF). These studies pointed out a change in the relationship when removing the flattening filter, although only a slight change in the relationship between %dd(10) x and

{false(\overset{L}{true} false/ italicρ false)}_{air}^{water}

was observed.…”

Section: Introductionmentioning

confidence: 99%

“…Ceberg et al . and Dalaryd introduced dual‐parameter beam‐quality specifiers to predict more accurately

{false(\overset{L}{true} false/ italicρ false)}_{air}^{water}

in WFF and FFF fields.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Monte Carlo-based investigations on the impact of removing the flattening filter on beam quality specifiers for photon beam dosimetry

Czarnecki¹,

Poppe

Zink³

2017

Med. Phys.

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The results of this study have shown that removing the flattening filter led to a change in the relationship between the well-known beam quality specifiers and dosimetric quantities at the point of measurement, namely (L¯/ρ)airwater, mean photon and electron energy. Furthermore, the results show that a beam profile correction is important for dose measurements with large ionization chambers in flattening filter free beams.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

“…Several Monte Carlo‐based studies investigated the relationship between %dd(10) x and TPR

_{10}^{20}

, respectively, and

{false(\overset{L}{true} false/ italicρ false)}_{air}^{water}

{false(\overset{L}{true} false/ italicρ false)}_{air}^{water}

was observed.…”

Section: Introductionmentioning

confidence: 99%

“…Ceberg et al . and Dalaryd introduced dual‐parameter beam‐quality specifiers to predict more accurately

{false(\overset{L}{true} false/ italicρ false)}_{air}^{water}

in WFF and FFF fields.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Monte Carlo-based investigations on the impact of removing the flattening filter on beam quality specifiers for photon beam dosimetry

Czarnecki¹,

Poppe

Zink³

2017

Med. Phys.

View full text Add to dashboard Cite

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Impact of detector selections on inter‐institutional variability of flattening filter‐free beam data for TrueBeam™ linear accelerators

Tanaka

Akino

Mizuno

et al. 2019

J Applied Clin Med Phys

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This study evaluates the type of detector influencing the inter-institutional variability in flattening filter-free (FFF) beam-specific parameters for TrueBeam™ linear accelerators (Varian Medical Systems,Palo Alto, CA, USA). Twenty-four beam data sets, including the percent depth dose (PDD), off-center ratio (OCR), and output factor (OPF) for modeling within the Eclipse (Varian Medical Systems) treatment planning system, were collected from 19 institutions. Although many institutions collected the data using CC13 (IBA Dosimetry, Schwarzenbruck, Germany) or PTW31010 semiflex (PTW Freiburg, Freiburg, Germany) ionization chambers, some institutions used diode detectors, diamond detectors, and ionization chambers with smaller cavities. The OCR data included penumbra width, full width at half maximum (FWHM), and FFF beam-specific parameters, including unflatness and slope. The data measured by CC13/PTW31010 ionization chambers were compared with those measured by all other detectors. PDD data demonstrated the variations within ±1% at the dose fall-off region deeper than peak depth. The penumbra widths of the OCR measured with the CC13/PTW31010 detectors were significantly larger than those measured with all other detectors (P < 0.05). Especially the EDGE detector (Sun Nuclear Corp., Melbourne, FL, USA) and the microDiamond detectors (model 60019; PTW Freiburg) demonstrated much smaller penumbra values compared to those of the CC13/PTW31010 detectors for the 30 × 30 mm 2 field. There was no difference in the FWHM, unflatness, and slope parameters between the values for the CC13/ PTW31010 detectors and all other detectors. OPF curves demonstrated small variations, and the relative difference from the mean value of each data point was almost within 1% for all field sizes. Although the penumbra region exhibited detector-dependent variations, all other parameters showed tiny interunit variations regardless of the detector type. P A C S 87.56.bd K E Y W O R D S beam data commissioning, detector selection, flattening filter-free beam, TrueBeam

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Monte Carlo study of ionization chamber magnetic field correction factors as a function of angle and beam quality

2018

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Orienting the chamber parallel to the magnetic field when the field is perpendicular to the photon beam will minimize the effect of the magnetic field on chamber response, and eliminate the problem of the unknown sensitive volume. Values of k and kQmag can bring ion chamber dosimetry in magnetic fields in-line with the TG-51 protocol. PP chamber are sensitive to the magnetic field and variation in chamber response due to small angular changes makes them unlikely candidates for clinical reference dosimetry in magnetic fields. The stability in TPR1020, as a function of magnetic fields and beam qualities, makes it the best beam quality specifier in magnetic fields.

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Combining tissue‐phantom ratios to provide a beam‐quality specifier for flattening filter free photon beams

Cited by 21 publications

References 26 publications

Monte Carlo-based investigations on the impact of removing the flattening filter on beam quality specifiers for photon beam dosimetry

Monte Carlo-based investigations on the impact of removing the flattening filter on beam quality specifiers for photon beam dosimetry

Impact of detector selections on inter‐institutional variability of flattening filter‐free beam data for TrueBeam™ linear accelerators

Monte Carlo study of ionization chamber magnetic field correction factors as a function of angle and beam quality

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