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Patient and staff dosimetry in diagnostic and interventional radiology

Tuesday, 19 February, 2008 - 17:00
Campus: Brussels Health Campus
Faculty: Medicine and Pharmacy
auditorium P. Brouwer
Nico Buls
phd defence

This work evaluated radiation doses for a
selection of x-ray examinations in diagnostic and
interventional radiology (IR) that offer unusual
challenges to radiation protection. For IR
applications, doses were evaluated during
endoscopic retrograde cholangiopancreatography
(ERCP) and during procedures that applied CT
Fluoroscopy (CTF). Results demonstrated the risk
for high patient skin doses and identified that the
eye of the interventionalist is the organ at most
risk. A drastic dose reduction in CTF was
achieved due the combination of utilising a low
tube current technique in combination with
intermittent fluoroscopy and a system that
interrupts x-ray tube exposure when it travels
above the patient. In the diagnostic radiology
field, a multi-centre study was performed of
doses to children from CT scans, and an
assessment was performed of dose and risk from
prospective health screening programmes with
CT. Results demonstrated that children may be
exposed to unnecessarily high radiation doses
when scan parameters are not optimised. Excess
mortality risk factors are demonstrated for
potential health screening programmes with CT.
They indicate that dose should be considered as a
fundamental parameter for outlining a screening
strategy. Screening with CT could be justified for
a targeted population with an elevated
predisposed mortality risk. Patient dose
optimisation also involves quality assurance of
the total imaging chain in radiology. We identified
physical properties of medical display devices
that influenced diagnostic performance and
suggest a quality assurance programme to detect
non-optimised systems.