Physica Medica: European Journal of Medical Physics - Volume 32 - Supplement 1 - February 2016

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Radioprotection and BSS EURATOM Directive
D.393
A SOFTWARE PACKAGE FOR DATA REGISTRATION AND ANALYSIS IN
INTERVENTIONAL RADIOLOGY
F. Banci Buonamici A. Guasti G. Belmont E. Vanzi L. Mazzon
G. De Otto A. Bogi M. Biondi A. Giani A. La Rocca L. Guerrin
A. Del Corona P. Manzi a UOC Fisica Sanitaria, Siena University Hospital,
Siena, Italy; b UOS Fisica Sanitaria, USL7 Siena, Siena, Italy; c UOP Diagnostica
per Immagini, Siena University Hospital, Siena, Italy; d Siweb2, Livorno, Italy;
e UOC Igiene Organizzazione Servizi Ospedalieri, Siena University Hospital, Siena,
Italy
Introduction: The growing importance of interventional radiology re-
quires data bases containing both worker’s workload and treatment’s
dosimetric data. Such data, if available, could be used for radiation pro-
tection, contractual issues and to compare dosimetric data of a specific
treatment (e.g., CA or PTCA) with published data.
Material and Methods: In cooperation with Siweb2 software house
, an SQL based software, named ‘Vidia’, has been de-
veloped, which interfaces with exposed workers database or may use a
stand-alone database.
Radiographers, using a fast and simple interface, insert all treatment data
(procedure, operator’s name and role, beam-on time, DAP, air kerma, kV,
mA, etc). Although some data are available from RIS PACS systems, it is
worthy to note that in RIS PACS there is a lack of many necessary info, e.g.
operator’s name and role, and usually they does not allow statistical anal-
ysis. Vidia works like a service lying in external servers, therefore no local
installation is required, except a web browser (Firefox or Chrome) access-
ing the web, then overall costs may be largely reduced. Each user has a
password that makes any data traceable.
Results: After one year of testing the software is being used from June 1st.
It is used in hemodynamic, electrophysiology, angiography, neurosur-
gery, orthopedic and vascular surgery. DAP and operator’s exposure statistics
have been extracted and comparison with available published data is
ongoing; further analysis results will be used for both radiation protec-
tion considerations (e.g. selection of operators for double dosimeter or leaded
glasses use) and contractual benefits.
Conclusions: Adopting a structured database for interventional proc-
edure’s workload makes an amount of data that would otherwise be difficult
to find quickly available. Statistical analyses have been proven signifi-
cantly helpful for radiation protection and management activities.
D.394
PEDIATRIC IN VIVO DOSIMETRY: A NOVEL PROCEDURE FOR
RETINOBLASTOMA CHEMOEMBOLIZATION
M. Biondi A. Bogi L.N. Mazzon E. Vanzi G.M. Belmonte G. De Otto
G. Corridori A. Guasti L. Guerrin A.E. La Rocca F. Banci Buonamici
a Department of Medical Physics, University Hospital of Siena, Siena, Italy;
b Department of Medical, Surgical and Neurosciences, University of Siena, Siena,
Italy; c Department of Medical Physics, U.S.L. 7, Siena, Italy
Introduction: Retinoblastoma is a pediatric pathology affecting 4- to 6-year-
old children. An alternative to ocular enucleation is the arterial
chemoembolization (AC). This treatment requires an angiographic proce-
dure and is repeated for at least three times. Due to the radiation sensitivity
of these patients a dose evaluation for the most irradiated organs is man-
datory. However AC is a recent technique and there is not a commonly
accepted procedure for the dose estimation. The aim of this work is the
realization of a standard procedure to evaluate the dose received by ex-
ternal and internal organs for every patient.
Material and Methods: In order to evaluate internal organ doses, previ-
ously calibrated TLDs were placed both inside and on the head surface of
an anthropomorphous phantom. Irradiation geometry used during AC pro-
cedures was associated with different dose distributions. For this reason
external dosimeters placed on both temples and on beam entry side crys-
talline were used in order to obtain entrance/exit dose measurements and
a field size estimation.
In a second time a clinical procedure involving medical physicist, radiol-
ogist and radiographer was developed. External TLDs were placed on each
patient and their measurements recorded for internal dose evaluation.
Results: By irradiating the phantom it was possible to calculate the ratio
between internal organs dose and entrance dose for different irradiation
conditions. With these results it was possible to correlate in vivo mea-
surements to the organ dose distribution.
14 treatments on 8 different patients were analyzed; external dosimeter
ratio was used for a field size estimation. Up to 31 mGy were measured
for left crystalline in a single AC with a cumulative dose of 208 mGy.
Conclusions: This procedure, which guarantees robust results, allows moni-
toring the high organs doses recorded in AC for pediatric patients. Crystalline
doses strongly depend on field aperture and vary from 3 mGy to 30 mGy
in a single treatment.
D.395
EXPERIMENTAL STUDY OF THE CORRELATION BETWEEN DAP AND
OPERATOR EXPOSURE IN CARDIAC PROCEDURES
M. Biondi A. Bogi L.N. Mazzoni E. Vanz G.M. Belmont G. De Ott
S. Bassol A. Guasti L. Guerrini A.E. La Rocca F. Banci Buonamici
a Department of Medical Physics, University Hospital of Siena, Siena, Italy;
b Department of Medical, Surgical and Neurosciences, University of Siena, Siena,
Italy; c Department of Medical Physics, U.S.L. 7, Siena, Italy
Introduction: Coronary catheterization (CC) and angioplasty (AP) expose
operators at high doses. Effective dose prediction is difficult because of many
involved factors, therefore individual dosimeters are mandatory. The aim
of this work is to study if exists a correlation between operator’s dose and
DAP that may be used as a dose predictor.
Materials and Methods: For each procedure dosimeters according to ope-
rator’s role were assigned: they were added to usual personal dosimeter.
One or two dosimeters were assigned according to role, the first placed at
thorax level, outside the lead apron, the second (if one) outside the neck
collar. In this way it was possible to evaluate effective dose and equiva-
lent dose to lens (assuming that at this energies Hp(10) is a good estimate
of Hp(3)).
Each dosimeter was used for more repetition of the same procedure (ir-
respectively of the operator, only taking care of operator role) in order to
collect a significant dosimeter cumulated dose especially for those who re-
ceived lower doses.
Results: Average duration, DAP and operator mean dose were evaluated
for each procedure and the mean ratio between operator’s dose and DAP
was calculated. All ratios Hp(10)/DAP were in the range (mean ± 2SD) and
(mean + 2SD) was lower than (mean*2). Therefore (2* measured mean) mul-
tiplied by actual DAP overestimates operator dose less than a factor two
at 95% confidence level. E.g. in case of CA we found for first operator an
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