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In vivo dosimetry with radiochromic films in low-voltage intraoperative radiotherapy of the breast
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Image of FIG. 1.
FIG. 1.

Schematic diagrams showing the setup for measurement of HVL (a) and calibration of radiochromic films (b).

Image of FIG. 2.
FIG. 2.

Schematic diagram showing the location of radiochromic on the skin, inside the excision cavity and under the shielding for in vivo dosimetry in TARGIT of the breast.

Image of FIG. 3.
FIG. 3.

Ultrasound images showing the radiochromic film dosimeter inside the lumpectomy cavity. The 1 × 1 cm2 film piece is seen as a horizontal white strip between two markers (+) in contact with the round surface of the applicator, which has a diameter of 4.5 cm.

Image of FIG. 4.
FIG. 4.

Radiochromic films positioned on the skin before the applicator is inserted in the breast. Note that the skin edges are pulled away from the surgical excision.

Image of FIG. 5.
FIG. 5.

Radiochromic films exposed for in vivo dosimetry in TARGIT in the following positions: (a) on the skin far from the surgical cavity, (b) under the tungsten shield treatment for treatments of the left breast, (c) on the skin edge as close as possible to the applicator, and (d) inside the surgical cavity, in contact with the target tissue.

Image of FIG. 6.
FIG. 6.

Calibration curve (dose in cGy vs netOD) of EBT2 radiochromic films in the red and green channel for film batch no. F03181001A, calibrated with 6 MV and 50 kVp sources. The error bars represent estimated uncertainties in measured dose and netOD (1 SD).


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Correction factors and their uncertainty (one standard deviation) used to convert ion chamber measurements to absorbed dose to films during the calibration.

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Measured half-value layers (HVL) for rays emitted by the Intrabeam with different applicators. All measurements were done with a tension of 50 kVp and a current of 40 μA.

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Comparison of dose measured with film using calibration curve for 3.5 cm applicator to that calculated from ion chamber measurements. Uncertainties are calculated as one standard deviation of measurements.

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Results of in vivo dosimetry of the target tissue and organs at risk with radiochromic films in TARGIT of the breast.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In vivo dosimetry with radiochromic films in low-voltage intraoperative radiotherapy of the breast