Borota L, Patz A. Flexible lateral isocenter: A novel mechanical functionality contributing to dose reduction in neurointerventional procedures.
Interv Neuroradiol 2017;
23:669-675. [PMID:
28944706 PMCID:
PMC5814073 DOI:
10.1177/1591019917728260]
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Abstract
Aim of the study
A new functionality that enables vertical mobility of the lateral arm of a
biplane angiographic machine is referred to as the flexible lateral
isocenter. The aim of this study was to analyze the impact of the flexible
lateral isocenter on the air-kerma rate under experimental conditions.
Material and methods
An anthropomorphic head-and-chest phantom with anteroposterior (AP) diameter
of the chest varying from 22 cm to 30 cm simulated human bodies of different
body constitutions. The angulation of the AP arm in the sagittal plane
varied from 35 degrees to 55 degrees for each AP diameter. The air-kerma
rate (mGy/min) values were read from the system dose display in two settings
for each angle: flexible lateral isocenter and fixed lateral isocenter.
Results
The air-kerma rate was significantly lower for all AP diameters of the chest
of the phantom when the flexible lateral isocenter was used: (a) For 22 cm,
the p value was 0.028; (b) For 25 cm, the
p value was 0.0169; (c) For 28 cm, the
p value was 0.01005 and (d) For 30 cm, the
p value was 0.01703.
Conclusion
Our results show that the flexible lateral isocenter contributes
significantly to the reduction of the air-kerma rate, and thus to a safer
environment in terms of dose lowering both for patients and staff.
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