Abstract
Background and purpose
For conformal radiotherapy, it is feasible to achieve high accuracy in contouring
the outline of the target volume in treatment planning process. In contouring process,
target volume is occasionally defined by means of either surgical clips or skin marker
during patient anatomical data acquisition. Treatment planning systems are predicting
invalid radiation dose distributions by using surgical clips and skin marker within
the patient. Purpose of this study is the production of new skin marker which affects
less dose distributions of electron beam.
Materials and methods
The influences of lead and commercial markers on dose calculations in a 3D treatment
planning systems were investigated in terms of electron beam energy and dose profile
depth. Dose deviation with commercial marker was observed to smaller than lead marker.
However this dose deviation was still at big value. In order to reduce of this value,
barium sulfate suspension and ultrasound gel were mixed with different volumetric
ratio. With the purpose of acception the most suitable marker for radiation therapy,
obtained new suspensions were investigated in terms of visibility and dose deviation.
Results
B:G/1:10 marker was determined to cause optimum visibility and the lowest dose deviation
on dose calculations in terms of electron beam energy and dose profile depth.
Conclusions
Appropriate marker, mixture of substances such as barium sulfate suspension and ultrasound
gel can be produced. This marker is both ease of usage and practical and economical.
Each clinic can prepare marker which is peculiar to suspension with different concentration
of substance for specific visibility. But, it should be taken into account resultant
dose deviation to beam calculation depending on barium sulfate concentration.
Keywords
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Article info
Publication history
Published online: April 04, 2012
Accepted:
March 8,
2012
Received in revised form:
February 27,
2012
Received:
January 19,
2012
Identification
Copyright
© 2012 Associazione Italiana di Fisica Medica. Published by Elsevier Inc. All rights reserved.
