High-resolution dosimetry using radiochromic film and a document scanner

Stevens, Mark; Turner, John R.; Hugtenburg, Richard P.; Butler, P. H.

doi:10.1088/0031-9155/41/11/008

Cited by 60 publications

(39 citation statements)

References 15 publications

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“…Use of a document scanner for reading exposed radiochromic films and its application for measuring the dose distribution around a COM-type ophthalmic applicator has been reported previously (Stevens et al 1996). The scanner employed (Hewlett Packard ScanJet II) provided adequate spatial resolution but only the black and white imaging mode was used and the effective calibration was restricted to the range from 0 to 95 Gy.…”

Section: Scanner Selectionmentioning

confidence: 99%

Study of the Valence State of the Manganese Ions in PbTiO₃ Ceramics by Means of ESR

Hayashi

Andõ

Hamaji

et al. 1998

Jpn. J. Appl. Phys.

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This paper describes the evaluation of an inexpensive, commercially available 35 mm transparency slide scanner as a potential alternative scanning device for GafChromic TM HD-810 radiochromic dye film. Besides its low cost, the principal advantages of this type of scanner are high spatial resolution and high speed (a typical scan taking less than 1 min). With broad-band illumination the useful dose range using grey-scale imaging of GafChromic TM HD-810 is limited to about 50-800 Gy. By using the colour-scale imaging capability of the scanner we have been able to achieve a significant extension covering a similar range (15-2000 Gy) to that attainable using monochromatic illumination. The short-term reproducibility of the system is good, with a coefficient of variation of doses estimated from repeat scanning of uniformly exposed calibration films of less than 2%. Long-term stability is ensured by the scanning of a manufacturer-supplied test slide. The slide scanner system has been used in the determination of depth dose distributions from a model 'hot particle' source containing 106 Ru/Rh. GafChromic TM dye film stacks irradiated by the source were read out on both the slide scanner and a conventional Joyce Loebl MDM6 scanning stage microdensitometer. The overall agreement between the dose estimates provided by the two systems was within 10%.

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Section: Scanner Selectionmentioning

confidence: 99%

Study of the Valence State of the Manganese Ions in PbTiO₃ Ceramics by Means of ESR

Hayashi

Andõ

Hamaji

et al. 1998

Jpn. J. Appl. Phys.

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“…5. As reported in literature, 17 the red channel presents the highest sensitivity in the dose range suggested by ISP ͑0-800 cGy͒; we decided to use 500 cGy as prescribed dose to better exploit the dynamic range of this channel. The experimental points have been fitted by a degree-6 polynomial.…”

Section: Iia Ebt Gafchromic Filmmentioning

confidence: 99%

Fractionated stereotactic radiotherapy: A method to evaluate geometric and dosimetric uncertainties using radiochromic films

et al. 2009

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In the authors' hospital, stereotactic radiotherapy treatments are performed with a Varian Clinac 600C equipped with a BrainLAB m3 micro-multileaf-collimator generally using the dynamic conformal arc technique. Patient immobilization during the treatment is achieved with a fixation mask supplied by BrainLAB, made with two reinforced thermoplastic sheets fitting the patient's head. With this work the authors propose a method to evaluate treatment geometric accuracy and, consequently, to determine the amount of the margin to keep in the CTV-PTV expansion during the treatment planning. The reproducibility of the isocenter position was tested by simulating a complete treatment on the anthropomorphic phantom Alderson Rando, inserting in between two phantom slices a high sensitivity Gafchromic EBT film, properly prepared and calibrated, and repeating several treatment sessions, each time removing the fixing mask and replacing the film inside the phantom. The comparison between the dose distributions measured on films and computed by TPS, after a precise image registration procedure performed by a commercial piece of software (FILMQA, 3cognition LLC (Division of ISP), Wayne, NJ), allowed the authors to measure the repositioning errors, obtaining about 0.5 mm in case of central spherical PTV and about 1.5 mm in case of peripheral irregular PTV. Moreover, an evaluation of the errors in the registration procedure was performed, giving negligible values with respect to the quantities to be measured. The above intrinsic two-dimensional estimate of treatment accuracy has to be increased for the error in the third dimension, but the 2 mm margin the authors generally use for the CTV-PTV expansion seems adequate anyway. Using the same EBT films, a dosimetric verification of the treatment planning system was done. Measured dose values are larger or smaller than the nominal ones depending on geometric irradiation conditions, but, in the authors' experimental conditions, always within 4%.

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“…Radiochromic film has several advantages over radiographic film; no developing is required so variations introduced by the film processing step are eliminated, it is insensitive to visible light, allowing for ease of handling 116 , and the film is fabricated from low-atomic number materials 106 , so it does not influence the radiation beam to the same degree as silverbased film. On the other hand, radiochromic film still has limitations: it is relatively expensive, has a large relative variation in film uniformity up to ±6% and there is a strong polarisation effect, requiring care in film orientation during readout.…”

Section: Dose Verification In Radiotherapymentioning

confidence: 99%

On Radiotherapy Dose Verification With a Flat-Panel Imager

McDermott¹

2009

Radiotherapy and Oncology

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High-resolution dosimetry using radiochromic film and a document scanner

Cited by 60 publications

References 15 publications

Study of the Valence State of the Manganese Ions in PbTiO₃ Ceramics by Means of ESR

Study of the Valence State of the Manganese Ions in PbTiO₃ Ceramics by Means of ESR

Fractionated stereotactic radiotherapy: A method to evaluate geometric and dosimetric uncertainties using radiochromic films

On Radiotherapy Dose Verification With a Flat-Panel Imager

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High-resolution dosimetry using radiochromic film and a document scanner

Cited by 60 publications

References 15 publications

Study of the Valence State of the Manganese Ions in PbTiO3 Ceramics by Means of ESR

Study of the Valence State of the Manganese Ions in PbTiO3 Ceramics by Means of ESR

Fractionated stereotactic radiotherapy: A method to evaluate geometric and dosimetric uncertainties using radiochromic films

On Radiotherapy Dose Verification With a Flat-Panel Imager

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Product

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Study of the Valence State of the Manganese Ions in PbTiO₃ Ceramics by Means of ESR

Study of the Valence State of the Manganese Ions in PbTiO₃ Ceramics by Means of ESR