Metrological assessment of image quality in ultrasonic medical diagnostic equipment
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ORIGINAL ARTICLE
Metrological assessment of image quality in ultrasonic medical diagnostic equipment Raquel Monteiro Souza 1
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André Victor Alvarenga 1
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Lorena Itati Petrella 2
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Rodrigo P. B. Costa-Felix 1
Received: 30 March 2020 / Accepted: 27 July 2020 # Sociedade Brasileira de Engenharia Biomedica 2020
Abstract Purpose This paper presents a model for estimating uncertainty of measurement of performance parameters commonly used in the evaluation of ultrasound images. These are axial and lateral resolutions, contrast detail, spherical void, dead zone, image uniformity, measurement system accuracy, display and recording errors, vertical and horizontal distance accuracy, and anechoic object perception. Methods These parameters were measured by two technicians following the recommendations of document IEC/TS 61390:1996, using a phantom, and the model of uncertainty proposed based on the guide to the expression of uncertainty in measurement (BIPM JCGM 100:2008). Moreover, an evaluation was carried out after 1 year to assess changes in the equipment image quality tested. Results In the assessment of operator influence on measurements, it was found that there is no statistical evidence that measurement results are different among most of the parameters. The results of three parameters were considered different between the two operators: contrast-detail resolution, display and recording errors, and measurement system accuracy. When considering the normalized error in comparison to the measurements made by the same operator under the same conditions in two consecutive years, no parameter showed a difference, given the level of uncertainty practiced. Conclusion It is noteworthy that the proposed model of uncertainty contributes as an unprecedented way for metrological evaluation of diagnostic imaging by ultrasound. Keywords Measurement uncertainty . Ultrasound . Metrology . Ultrasonic medical diagnostic . Image quality assessment
Introduction Ultrasonic medical imaging equipment (USIE) allows for the study of biological organs through the generation of images
* André Victor Alvarenga [email protected] Raquel Monteiro Souza [email protected] Lorena Itati Petrella [email protected] Rodrigo P. B. Costa-Felix [email protected] 1
Laboratory of Ultrasound, National Institute of Metrology, Quality and Technology, Duque de Caxias, Brazil
2
Department of Electrical and Computer Engineering, Pole ll of the University of Coimbra, 3030-290 Coimbra, Portugal
from the emission and reception of acoustic waves, and it is widely used in most health centers around the world. Although the emergence of new medical device with increasingly sophisticated technologies provides more confidence in medical activities, there is still a need for technical quality control of such device (ISO 13485: 2016). A primary reason for this is that a set of periodic measurements for each transducer and ultrasound (US) unit can identify degradation in image quality before it affects patient scans (Goodsitt et al. 1998). A
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