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Poster — Thur Eve — 52: Clinical use of nanoDots: In‐vivo dosimetry and treatment validation for stereotactic targets with VMAT techniques
Author(s) -
Wierzbicki W,
Nicol S,
Furstoss C,
BrunetBenkhoucha M,
Leduc V
Publication year - 2012
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.4740160
Subject(s) - imaging phantom , nuclear medicine , dosimeter , thermoluminescent dosimeter , dosimetry , nanodot , pinnacle , materials science , medicine , radiation treatment planning , biomedical engineering , radiation therapy , radiology , optoelectronics
A newly acquired nanoDot In‐Light system was compared with TLD‐100 dosimeters to confirm the treatment dose in the multiple cases: an electron eye treatment, H&N IMRT and VMAT validation for small targets. Eye tumour treatment with 9 MeV electrons A dose of 1.8 Gy per fraction was prescribed to the 85% isodose. The average dose measured by three TLDs and three Dots was 1.90 and 1.97 Gy. Both detectors overestimated dose, by 2.9% and 6.7% respectively. H&N IMRT treatment of skin cancer with 6 MV photons Dose per fraction is 2.5 Gy. The average doses measured by two TLDs and two Dots were 2.48 and 2.56 Gy, which represent errors of −0.8% and 2.2%, respectively. VMAT validation for small targets using an Agarose phantom, dose 15 Gy A single‐tumour brain treatment was delivered using two coplanar arcs to an Agarise phantom containing a large plastic insert holding 3 nanoDots and 4 TLDs. The difference between the average Pinnacle dose and the average dose of the corresponding detectors was −0.6% for Dots and −1.7% for TLDs. A two‐tumour brain treatment was delivered using three non‐coplanar arcs. Small and large plastic inserts separated by 5 cm were used to validate the dose. The difference between the average Pinnacle dose and the average dose of the corresponding detectors was the following; small phantom 0.7% for Dots and 0.3% for TLDs, large phantom‐1.9% for Dots and −0.6% for TLDs. In conclusion, nanoDot detectors are suitable for in‐vivo dosimetry with photon and electron beams.