Automated and observer based light field indicator edge evaluation in diagnostic X-ray equipment

Bottaro, Marcio; Nagy, Balázs Vince; Soares, Fernanda Cristina Salvador; Rosendo, Danilo Cabral

doi:10.1590/2446-4740.07116

Cited by 1 publication

(1 citation statement)

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“…9 A similar approach, but for light field edges only, was presented by Bottaro et al (2017). 10 The novel device is based on a one-dimensional Linear Image Sensor (LIS). The denotation, "LISmethod", is therefore used for the developed device throughout the rest of this work.…”

Section: Introductionmentioning

confidence: 99%

Development and assessment of a quality assurance device for radiation field–light field congruence testing in diagnostic radiology

et al. 2020

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Purpose: Existing methods for checking the light field radiation field congruence on x-ray equipment either do not fully meet the conditions of various quality control standards regarding inherent uncertainty requirements or contain subjective steps, further increasing the uncertainty of the end result. The aim of this work was to develop a method to check the light field radiation field congruence on all x-ray equipment. The result should have a low uncertainty which is accomplished by eliminating most subjective user steps in the method. A secondary aim was to maintain the same level of usability as of comparable methods but still able to store the result.Approach: A new device has been developed where the light field and corresponding radiation field are monitored through measurements of the field edge locations (in total: 2 x 4 edges). The maximum field size location deviation between light field and radiation field in the new method, is constrained by the physical limitations of the sensors used in various versions of the prototype: Linear Image Sensors (LISs) of 25-29 mm active sensor length. The LISs were sensitized to x-rays by applying a phosphor strip of Gd2O2S:Tb covering the light sensor input area. Later prototypes of the completed LIS device also have the option of a Bluetooth (100 m range standard) connection, thus increasing the mobility. Results:The developed device has a special feature of localization a field edge without any prior, subjective, alignment procedure of the user, i.e. the signals produced were processed by software storing the associated field edge profiles, localizing the edges in them, and finally displaying the calculated deviation. The uncertainty in field edge location difference was estimated to be less than 0.1 mm (k=2). The calculated uncertainty is lower than for other, commercially available, methods for light field radiation field congruence also presented in this work. Conclusions:A new method to check the light field radiation field congruence of x-ray systems was developed to improve on the limitations found in existing methods, such as device detector resolution, subjective operator steps or the lack of storing results for later analysis. The development work overcame several challenges including mathematically describing real life edges of light and radiation fields, noise reduction of radiation edges and mapping/quantification of the rarely observed phenomenon of focal spot wandering. The assessment of the new method showed that the listed limitations were overcome, and the aims were accomplished. It is therefore believed that the device can improve the work in quality controls of x-ray systems.

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Section: Introductionmentioning

confidence: 99%