Project results
Diode
based system (Delta4)
IMRT verification sets high
demands on the detector system and read-out system.
Further, due to the need of QA measurements on each
individual treatment plan, the QA system must be well
integrated in the clinical environment. To analyse the
cause of any deviations from the treatment plan,
detailed information about the dose per fraction, beam,
segment and each control point is required. The
introduction of IMRT and 4DRT also prompts that QA can
be made of dynamic events such as MLC movements and the
synchronization of the radiation delivery with the
tumour motion. The InVoRad diode based system
efficiently addresses these problems.
A system
consisting of a phantom, read-out unit, and software has
been constructed to simultaneously measure the dose
distribution in 3D and 4D. Data can be analysed either
immediately or off-line to minimise the time that
treatment machines are occupied for QA measurements.
Measurements can easily be performed on a routine basis
whilst the analysis and approval of plans can be made
separately.
The system is marketed under the name
Delta4 by a commercial project partner
ScandiDos. Additional information can be found at ScandiDos
web site.
Promotional
poster can be found here.
Delta4
RADFET based
system
It is often desirable to
make intracavitary measurements of absorbed dose
distributions during radiotherapy treatments. For
example, during external beam treatment of rectal
carcinoma the dose delivered to the rectum and the
region of the anal verge is of critical importance in
controlling deleterious complications. Similarly,
intracavitary measurements during cervical treatments or
head and neck treatments would provide valuable
information on the absorbed dose to sensitive structures
such as the bladder and esophagus.
The
InVoRad consortium has developed a linear intercavitary
detector array for real-time in-vivo dosimetry. The
array consists of ten RADFETs (also known as MOSFET
dosimeters) with non-uniform spacing. It is constructed
specifically for measuring the dose distribution from
the location of the tumour to the position of the anal
verge during external beam radiotherapy treatment of an
anal carcinoma. All other dimensions of the array have
been chosen so that it is suitable for esophageal,
rectal, and vaginal placement.
The
dosimetric system consists of the RADFET intercavitary
array, read-out unit, and a dedicated software.
RADFET array in a
medical catheter
