ObjectiveTo evaluate three-dimensional translational setup errors and residual errors
in image-guided radiosurgery, comparing frameless and frame-based
techniques, using an anthropomorphic phantom.Materials and MethodsWe initially used specific phantoms for the calibration and quality control
of the image-guided system. For the hidden target test, we used an Alderson
Radiation Therapy (ART)-210 anthropomorphic head phantom, into which we
inserted four 5mm metal balls to simulate target treatment volumes. Computed
tomography images were the taken with the head phantom properly positioned
for frameless and frame-based radiosurgery.ResultsFor the frameless technique, the mean error magnitude was 0.22 ± 0.04
mm for setup errors and 0.14 ± 0.02 mm for residual errors, the
combined uncertainty being 0.28 mm and 0.16 mm, respectively. For the
frame-based technique, the mean error magnitude was 0.73 ± 0.14 mm
for setup errors and 0.31 ± 0.04 mm for residual errors, the combined
uncertainty being 1.15 mm and 0.63 mm, respectively.ConclusionThe mean values, standard deviations, and combined uncertainties showed no
evidence of a significant differences between the two techniques when the
head phantom ART-210 was used.
Of the selected patients, 80% had ≥81-95% of the Vol within 100% of the prescribed dose and predominantly had central or in-field recurrences. These results are comparable with those from the literature.
In Stereotactic radiosurgery (SRS), indexes are used to compare plans, comparing treatment techniques and evaluate clinical complications. However, they have some limitations and dependencies that need to be well known. Therefore, the analysis using indices is better suited for comparison of plans for the same patient (lesion). The evaluation of stereotactic plans must be undertaken with great care and criteria because there is a huge amount of information between different dose distributions of treatment plans. The objectives are to show some tools for planning analysis in SRS their limitations, some indexes descriptive review in the literature that seek to quantify the three properties mentioned and discuss the concepts involved in SRS dose prescription.
Introdução: o tratamento radioterápico para câncer de mama esquerda tem como consequência a cardiotoxicidade induzida por radiação. A partir da necessidade de minimizar as doses cardíacas, surgiu a técnica Deep Inspiration Breath Hold (DIBH). Objetivo: descrever as doses nas estruturas cardíacas por meio do Histograma Dose Volume (DVH) no tratamento radioterápico para câncer de mama esquerda com a técnica DIBH. Metodologia: a pesquisa se caracterizada como estudo de caso com múltiplas unidades de análise, do tipo descritivo, de natureza retrospectiva e com abordagem quantitativa. Resultados: a amostra foi composta por cinco unidades de análise. A dose média cardíaca para a técnica DIBH foi de 6 Gy; e para a artéria coronária descendente anterior esquerda, esta foi de 14,8 Gy. Quatro unidades de análise foram mais beneficiadas com a técnica, o resultado é justificado pela modalidade cirúrgica conservadora, enquanto uma unidade apresentou o menor benefício, uma vez que realizou mastectomia. Conclusão: a DIBH é uma alternativa para reduzir a toxicidade cardíaca em mulheres que realizam radioterapia para câncer de mama esquerda, principalmente em indivíduos que possuem outros fatores de risco associados à doença cardíaca.
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