Laser heating of thermoluminescent plates: Application to intraoperative radiotherapy

Beteille, D.; Setzkorn, R.; Prévost, H.; Dusseau, L.; Fesquet, J.; Gasiot, J.; Muraro, S.; Delard, R.; Dubois, J.B.; Aillères, N.; Missous, O.

doi:10.1118/1.597725

Cited by 6 publications

(3 citation statements)

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“…Il est ainsi possible de lire des plaques thermoluminescentes avec une résolution inférieure au millimètre, la taille minimale des pixels étant limitée par la diffusion thermique au niveau du point chauffé par le laser. Toutefois, en dépit de temps de lecture pénalisants (environ 30 minutes), d'un lecteur lourd et d'utilisation très délicate, ces systèmes ont permis de démontrer l'intérêt de la cartographie de dose pour la caractérisation de faisceaux de particules et la mesure 2D dans des géométries complexes (Albert et al, 1997 ;Setzkorn et al, 1997Setzkorn et al, , 1996Beteille et al, 1996 ;Prévost et al, 1995 ;Setzkorn, 1995 ;Vignolo, 1994 ;Sevière, 1993).…”

Section: Introductionunclassified

La luminescence stimulée optiquement : Applications à la cartographie de dose et à la mesure de dose en environnement spatial

et al. 2006

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Section: Introductionunclassified

La luminescence stimulée optiquement : Applications à la cartographie de dose et à la mesure de dose en environnement spatial

et al. 2006

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“…Laser-heated thermoluminescence dosimetry was first demonstrated on thin layers of powdered ceramics [1], and the combination of thermoluminescence and heat-transfer issues for this have been analysed [2]. This has applications in medicine [3,4]. Laser heating of the sample is interesting for three reasons.…”

Section: Introductionmentioning

confidence: 99%

Dose deposition profiles from laser-heated thermoluminescence

Lawless¹,

Hui²,

Kui³

et al. 2004

J. Phys. D: Appl. Phys.

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We use CO2 laser-induced thermoluminescence to measure radiation dose deposition profiles in thin films. Films of various thicknesses, ranging from 10 to 90 µm, are deposited on a substrate and irradiated. The deposited dose is read out at a high heating rate so that strong signals can be obtained even from thin films. Our experiments use LiF films and 90Sr and 241Am radiation sources. This method allows nondestructive measurement of deposition profiles directly in thin solid films.

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“…Dosimetry systems utilized in previously reported IORT studies include: ͑a͒ diodes, [20][21][22][23][24][25][26] ͑b͒ small volume ionization chambers, 20,22,23,[27][28][29][30][31][32][33][34] ͑c͒ film, [22][23][24]26,29,32,33,35 and ͑d͒ thermoluminescent dosimetric plates. 36 The aim of the present study is to examine the validity of using p-type silicon diodes for measurements of relative absorbed dose distributions in degraded electron beams for IORT. A comparison of a diode and a diamond detector measurement of IORT dose distributions is made using the latter detector as a reference.…”

Section: Introductionmentioning

confidence: 99%

Comparative dosimetry of diode and diamond detectors in electron beams for intraoperative radiation therapy

2000

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The aim of the present study is to examine the validity of using silicon semiconductor detectors in degraded electron beams with a broad energy spectrum and a wide angular distribution. A comparison is made with diamond detector measurements, which is the dosimeter considered to give the best results provided that dose rate effects are corrected for. Two-dimensional relative absorbed dose distributions in electron beams (6-20 MeV) for intraoperative radiation therapy (IORT) are measured in a water phantom. To quantify deviations between the detectors, a dose comparison tool that simultaneously examines the dose difference and distance to agreement (DTA) is used to evaluate the results in low- and high-dose gradient regions, respectively. Uncertainties of the experimental measurement setup (+/- 1% and +/- 0.5 mm) are taken into account by calculating a composite distribution that fails this dose-difference and DTA acceptance limit. Thus, the resulting area of disagreement should be related to differences in detector performance. The dose distributions obtained with the diode are generally in very good agreement with diamond detector measurements. The buildup region and the dose falloff region show good agreement with increasing electron energy, while the region outside the radiation field close to the water surface shows an increased difference with energy. The small discrepancies in the composite distributions are due to several factors: (a) variation of the silicon-to-water collision stopping-power ratio with electron energy, (b) a more pronounced directional dependence for diodes than for diamonds, and (c) variation of the electron fluence perturbation correction factor with depth. For all investigated treatment cones and energies, the deviation is within dose-difference and DTA acceptance criteria of +/- 3% and +/- 1 mm, respectively. Therefore, p-type silicon diodes are well suited, in the sense that they give results in close agreement with diamond detectors, for practical measurements of relative absorbed dose distributions in degraded electron beams used for IORT.

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Laser heating of thermoluminescent plates: Application to intraoperative radiotherapy

Cited by 6 publications

References 0 publications

La luminescence stimulée optiquement : Applications à la cartographie de dose et à la mesure de dose en environnement spatial

La luminescence stimulée optiquement : Applications à la cartographie de dose et à la mesure de dose en environnement spatial

Dose deposition profiles from laser-heated thermoluminescence

Comparative dosimetry of diode and diamond detectors in electron beams for intraoperative radiation therapy

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