Quality parameters and assessment methods of digital radiography images

The replacement of film technology with digital in radiographic monitoring during the construction and repair of pipelines is a pressing issue. The new technology is based on the use of phosphorous plates (computed radiography) and digital array detectors (digital radiography). However, there is the problem of defining requirements for digital radiograms. Selection of image quality class in digital radiographic testing is carried out in coordination with the customer, even though the requirements for the quality of film-based images are set out in regulations. The authors have carried out a study and provided a method making it possible to minimize the influence of the human factor in assessing the descriptiveness of radiographic images and to impartially determine the requirements for a digital radiogram when the use of computed and digital radiography may be recommended as a replacement for film technology. In order to solve this problem there has been a proposal to use ROC analysis, making it possible to estimate binary classification, including decryption of radiograms based on the «defect – no defect» principle. A test sample containing areas with defects (defect simulators) and areas with no such defects, which made it possible to use a binary classification for the analysis of its radiograms, has been developed and manufactured. A minimum sample size of independent experts sufficient to exclude the influence of the human factor on decoding test sample images has been identified. A film radiogram corresponding to regulatory requirements has been made in order to compare film-based and digital technologies. Following the analysis of this image, a base ROC curve has been plotted. This formed the basis for comparing ROC curves plotted following the results of decoding digital images with different quality parameters. It made it possible to establish values for quality parameters when the descriptiveness of digital radiograms was higher than of film-based images, and to draw conclusions about the circumstances in which it is possible to replace film-based technology with digital and computed radiography.

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Assessment methods and competency mapping in pharmacy education: Understanding of components and quality parameters

Journal of Research in Pharmacy Practice ◽

10.4103/jrpp.jrpp_21_29 ◽

2021 ◽

Vol 10 (2) ◽

pp. 102

Author(s):

SyedWasif Gillani ◽

KishoreGnana Sam ◽

FithawitBahran Gebreigziabher ◽

Jumana Al-Salloum ◽

RizahAnwar Assadi ◽

...

Keyword(s):

Quality Parameters ◽

Assessment Methods ◽

Pharmacy Education

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Assessment of image quality and radiation dose in some models of digital radiography systems – A Pehamed FLUORAD A + D phantom study

Radioprotection ◽

10.1051/radiopro/2018012 ◽

2018 ◽

Vol 53 (2) ◽

pp. 139-144

Author(s):

H. Kaheni ◽

A. Chaparian ◽

R. Nafisi-Moghadam ◽

N. Hamzian

Keyword(s):

Image Quality ◽

Radiation Dose ◽

Digital Radiography ◽

Quality Parameters ◽

Digital Systems ◽

Quality Performance ◽

Dose Area Product ◽

Ideal Situation ◽

Conventional Film ◽

Area Product

Digital radiography (DR) systems have been recently introduced as a developed technology that is replacing conventional film–screen systems in many countries around the world. Ideal situation in radiography is to maximize the image quality while minimizing the patient dose. The purpose of this study was to compare image quality and radiation dose in different digital radiography systems. Four different digital systems are compared in terms of their image quality performance and dose area product (DAP). Images of Pehamed FLUORAD A + D phantom were obtained for each DR system. Image quality parameters (contrast resolution (CR), spatial resolution (SR), and contrast-to-noise ratio (CNR)) and DAP were significantly different between different digital systems. It was shown that all four quantities increased with increasing exposure parameters in all systems. Image quality parameters of the SEDECAL system were higher than that in other systems (p ≤ 0.05). At the stable DAP (100 mGy.cm2), means of CR, CNR, and SR in the SEDECAL system were 6.38 ± 0.797, 29.70 ± 0.85 and 3.10 ± 0.38 lp/mm, respectively. The results of this investigation can be taken into consideration in the selection and purchasing of new systems in order to preserve patients as well as radiographers from unnecessary radiation dose.

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To the Issue of Organization of Transport Service of Limited Mobility People

MATEC Web of Conferences ◽

10.1051/matecconf/202133402008 ◽

2021 ◽

Vol 334 ◽

pp. 02008

Author(s):

Norair Bludyan

Keyword(s):

Public Transport ◽

Social Group ◽

Services Quality ◽

Legal Regulation ◽

Quality Parameters ◽

Assessment Methods ◽

Transport Service ◽

Limited Mobility ◽

Transport Accessibility ◽

Transport Services

This article represents the analysis results of normative legal regulation in the transport services field for people with limited mobility (LMP) and assessment methods of transport services quality provided by public transport for the same social group. The main conclusions of the significance examination of quality parameters are given below. The essential problems of transport accessibility provision were defined by materials of sociological polls.

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