Περίληψη:
The purpose of the study was to analyse the technical characteristics of
a newly installed flat-panel fluoroscopy (FPF) system in an
interventional cardiology (IC) department and compare it with an older
conventional system. A patient survey, was performed to investigate the
radiation doses delivered by the X-ray systems. Finally, methods of
technique optimization regarding the new digital system were
investigated. Dose rates in all fluoroscopic and cine modes were
measured and image quality assessed using a dedicated test tool. 200
patients were investigated, half using the conventional and half using
the digital FPF system. Patient data collected were: sex, age, weight,
height, dose-area product (DAP), fluoroscopy time (7) and total number
of frames (T). Our results are: (1) Digital FPF system: high contrast
resolution (HCR) is not affected by fluoroscopic mode, whereas low
contrast resolution (LCR) is slightly decreased in the low mode. (2) The
digital FPF system has 2.5 times better HCR than the conventional
system, with 5 times lower dose in the fluoroscopy mode. (3) Median
values of DAP, T and F, respectively, in coronary angiography (CA) are:
27.7 Gycm(2), 4.1 min and 876 for the digital and 39.3 Gycm(2), 5.3 min
and 1600 for the conventional system. Median values for percutaneous
transluminal coronary angioplasty (PTCA) are: 51.1 Gycm(2), 12.7 min and
1184 for the digital and 44.3 Gycm(2), 7.4 min and 1936 for the
conventional system. Digital DAP in CA is reduced by 30%, suggesting
that a dose reduction in the FPF system is possible. The results of the
study concerning the FPF system lead to the conclusion that the lowest
fluoroscopic mode and the lowest frame rate should be used in routine
practice.
Συγγραφείς:
Tsapaki, V
Kottou, S
Kollaros, N
Dafnomili, P
Koutelou,
M
Vano, E
Neofotistou, V
