1 Keywords
Biostatistics, analysis, anatomy, heart, CT, MRI, RAV (right atrium volume), sys-
tole, diastole
2 Introduction
The aim of this assignment is to enlighten the differences between CT and MRI
methods on heart diseases’ diagnosis by using data of a statistic analysis. Studies
have shown that monitoring of the RAV is of prognostic interest for cardiopulmonary
diseases. RAV is estimated by measuring either single diameters, areas, or three-
dimensional functional data sets. So, it is needed to be found a quick and reliable
method to interpret the RAV. MRI is appropriate for volumetry of the heart due to
natural high soft tissue contrast, free image plane placement lack of radiation and
high temporal resolution. On the contrary, CT gives optimized contrast protocols,
the high-speed scanning has enhanced image quality and radiation exposure will be
diminished on an acceptable level.
3 Materials and methods
In this study 29 patients were examined by CT and MRI within the period of 90 days.
These patients were supposed neither suffering from cardiac arrhythmia nor receiving
beta-blockers. CT examinations were performed with a 64-slice dual source scanner
and the patients were dispensed 20ml iopromide, followed by contrast bolus of 115ml
and a 40ml saline bolus chaser. On MRI examinations, 21 patients were examined
by retrospective gating (MRI data are acquired continuously) while 8 patients were
examined by prospectively triggered sequential scan (MRI data are acquired only
after a detection of a desired physiologic event). All scans were performed with a
collimation of 64 x 0.6mm, 320 effective mAs, tube voltage was 100kV for BMI 25
kg/m2 and 120kV for BMI¿25kg/m2 ,rotation time was 0,33 sec and reconstructed
matrix 512 x 512

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