Abstract
Electronic portal imaging devices (EPIDs) have been the preferred tools for verification
of patient positioning for radiotherapy in recent decades. Since EPID images contain
dose information, many groups have investigated their use for radiotherapy dose measurement.
With the introduction of the amorphous-silicon EPIDs, the interest in EPID dosimetry
has been accelerated because of the favourable characteristics such as fast image
acquisition, high resolution, digital format, and potential for in vivo measurements
and 3D dose verification. As a result, the number of publications dealing with EPID
dosimetry has increased considerably over the past ∼15 years. The purpose of this
paper was to review the information provided in these publications. Information available
in the literature included dosimetric characteristics and calibration procedures of
various types of EPIDs, strategies to use EPIDs for dose verification, clinical approaches
to EPID dosimetry, ranging from point dose to full 3D dose distribution verification,
and current clinical experience. Quality control of a linear accelerator, pre-treatment
dose verification and in vivo dosimetry using EPIDs are now routinely used in a growing
number of clinics. The use of EPIDs for dosimetry purposes has matured and is now
a reliable and accurate dose verification method that can be used in a large number
of situations. Methods to integrate 3D in vivo dosimetry and image-guided radiotherapy
(IGRT) procedures, such as the use of kV or MV cone-beam CT, are under development.
It has been shown that EPID dosimetry can play an integral role in the total chain
of verification procedures that are implemented in a radiotherapy department. It provides
a safety net for simple to advanced treatments, as well as a full account of the dose
delivered. Despite these favourable characteristics and the vast range of publications
on the subject, there is still a lack of commercially available solutions for EPID
dosimetry. As strategies evolve and commercial products become available, EPID dosimetry
has the potential to become an accurate and efficient means of large-scale patient-specific
IMRT dose verification for any radiotherapy department.
Keywords
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Article info
Publication history
Published online: August 15, 2008
Accepted:
July 12,
2008
Received in revised form:
July 9,
2008
Received:
April 9,
2008
Identification
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© 2008 Elsevier Ireland Ltd. Published by Elsevier Inc. All rights reserved.
