Background/introduction
In order to assess dose optimization in clinical CT,
radiation dose structured reports (RSDR) have been recently implemented in radiological equipment,
in particular in CT scanners.
Among the several parameters which influence dose optimization,
isocenter shift has been studied in order to determine a specific link between absorbed dose recorded and isocenter shift,
parameters usually available from the RSDR [1].
In this poster,
a specific study on CTDI dependence on isocenter shift has been shown.
Description of activity and work performed
Data have been collected from a clinical CT structured report proprietary software,
installed in “Fondazione Policlinico Universitario A.
Gemelli IRCCS Università Cattolica del Sacro Cuore",
Rome,
detecting diagnostic tests performed in the last 12 months on a single CT scanner,
and splitting examinations held with two different clinical protocols: “head CT head first”,
“head CT feet first”.
Too low CTDIvol values (probably due to clinical routine inaccuracies) have been removed from the dataset,
and a reasonable homogeneity of head dimension between the patients in the...
Conclusion and recommendations
According to a preliminary analysis,
no correlation has been evidenced in current datasets.
In reverse,
correlation deduced from the phantom measurements pointed out that a future data acquisition on several configurations should be performed in order to determine such a statistical connection.
Possible further developments could include a thorough clinical study of the isocenter shift,
split for the main clinical protocols (e.g.
head,
abdomen,
chest),
with the aim at achieving dose optimization in diagnostic CT clinical routine.
It is very important to carry out phantom...
Personal/organisational information
Dose-Optimization Strategies are organized in our hospital in staff between Radiographers,
Medical Physicists and Radiologists according to Euratom directives and Italian laws.
Diagnostic Procedures are periodically revisited to improve dose and image quality optimization.
References
[1] A.
Parakh et al(2016),
“CT Radiation Dose Management: A Comprehensive Optimization Process for Improving Patient Safety”,
RSNA Radiology,
280 n.
3,
663-673
DOI:10.1148/radiol.2016151173
[2] T.
Kassalainen et al (2019),
“The effect of verticalcentering and scout direction on automatic tube voltage selection in chest CT: a preliminary phantom study on two different CT equipments”,
European Journal of Radiology Open,
6,
24-32
DOI: 10.1016/j.ejro.2018.12.001