ABSTRACT
Objective:To explore the calculation method for benefits of economy and society, and analyze and evaluate the performance of large medical imaging equipment.Methods: The data of magnetic resonance imaging (MRI), computed tomography (CT) and digital radiography (DR) during 2014-2016 were analyzed and the used frequency of equipment in research and teaching task was adopted to evaluate their social benefit. Accounting of single machine method and return on investment method were applied to calculate economic benefit. Finally, the benefit of large medical equipment was comprehensively and systematically evaluated.Results:The benefits of CT and MRI were good, and their overall benefit got steadily growth. While the overall benefit of DR was decline, even individual benefit of DR was loss. For these equipments whose benefits were not ideal, their disadvantages in purchasing, using and management process has been analyzed, and the continuous improvement and suggestion has been provided.Conclusion: Social benefits is an important part of the performance of large medical equipment used in research and teaching. The comprehensive assessment that economic benefits combines with social benefits has great significant for the cost-benefit analysis of large medical equipment.
ABSTRACT
<p><b>OBJECTIVE</b>Ultrasonic pulse wave Doppler technique for noninvasive blood flow imaging does not provide precise information of complex blood flow field, and observing two-dimensional artery blood flow field distribution provides important clinical information for cardiovascular disease.</p><p><b>METHODS</b>Ultrasonic particle image velocimetry (Echo PIV) was used to measure blood flows on B-mode ultrasonic particle image to assess the whole field velocity of the blood vessels in 5 groups of healthy rats. The reliability of Echo PIV was verified in comparison with ultrasonic Doppler method in 3 cardiac cycles.</p><p><b>RESULTS AND CONCLUSION</b>The results of Echo PIV were similar with the those of ultrasound spectral Doppler. The Echo PIV-measured peak and average velocity within 3 cardiac cycles were about 5%-10% and 2%-8% below the values measured by the ultrasonic spectral Doppler, respectively, but these differences were not statistically significant (P>0.05). As a new technique for monitoring complex blood flow in stenotic arteries, echo PIV can be used to directly and non-invasively assess whole field hemodynamic changes in blood vessels in real time and distinguish different groups of rats by velocity.</p>