Relationship between the visual evaluation of pathology visibility and the physical measure of low contrast detail detectability in neonatal chest radiography

Al-Murshedi, Sadeq; Benhalim, M.; Alzyoud, Kholoud; Papathanasiou, S.; England, Andrew

doi:10.1016/j.radi.2022.08.006

Cited by 2 publications

(3 citation statements)

References 28 publications

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“…Physical phantoms are widely used to assess the image quality of x-ray imaging systems (Konst et al 2019, Al-Murshedi et al 2022. The materials used to manufacture these phantoms often simulate the tissues of the human body in terms of densities and atomic composition.…”

Section: Introductionmentioning

confidence: 99%

Improving input contrast estimation to an x-ray imaging system

González-López

2023

Phys. Med. Biol.

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Objective: An appropriate parameter to study the performance of an X-ray imaging system is contrast transfer, or the system's ability to capture contrast in the radiation beam and bring it to the image. However, determining the input contrast to the system is difficult, as it is heavily affected by secondary radiation, which in turn depends on a multitude of factors. This work presents a method to improve the calculation of input contrast to the imaging system when PMMA phantoms are used. Approach: An expression to obtain input contrast from primary radiation attenuation and scatter-to-primary ratio is shown, and the approximation upon which it is based is discussed. Primary and secondary radiation emerging from the phantoms are calculated for monoenergetic pencil beams impinging on planar PMMA phantoms of different thicknesses. Monte Carlo simulations of two types of anti-scatter grids are also incorporated into the calculations. Main results: The primary and secondary components of radiant energy and grid transmission factors are presented for monoenergetic beams with energies from 10 to 150 keV. These results are then used to calculate input contrast for polyenergetic beams when using a commercial image quality phantom combined with different thicknesses of PMMA and anti-scatter grids.Significance: The information of the object contrast carried by the beam constitutes the input to the imaging system. An accurate determination of this input contrast can be carried out in a wide variety of situations from the study of a reduced number of cases, as those presented in this work for monoenergetic beams, PMMA phantoms of different thicknesses and anti-scatter grids. The relationship between the input contrast and the contrast due to primary radiation used in this work provides a good approximation for the different combinations of inserts, phantoms, grids, and energy spectra analyzed here.

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Section: Introductionmentioning

confidence: 99%

Improving input contrast estimation to an x-ray imaging system

González-López

2023

Phys. Med. Biol.

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“…The CDRAD 2.0 phantom and IQF inv measurements have been used widely for optimization studies and when comparing different DR detector types 17–20 . Studies reported a strong relationship with visual IQ when evaluating lesion visibility, especially for CXR 21–23 …”

Section: Methodsmentioning

confidence: 99%

“…[17][18][19][20] Studies reported a strong relationship with visual IQ when evaluating lesion visibility, especially for CXR. [21][22][23] The radiation dose recorded from Dose Area Product (DAP) was measured three times for each exposure to reduce random error.…”

Section: Image Quality Evaluation and Dose Measurementmentioning

confidence: 99%

Effects of body part thickness on low‐contrast detail detection and radiation dose during adult chest radiography

Al‐Murshedi,

Alzyoud,

Benhalim

et al. 2023

J of Medical Radiation Sci

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IntroductionDifferences in patient size often provide challenges for radiographers, particularly when choosing the optimum acquisition parameters to obtain radiographs with acceptable image quality (IQ) for diagnosis. This study aimed to assess the effect of body part thickness on IQ in terms of low‐contrast detail (LCD) detection and radiation dose when undertaking adult chest radiography (CXR).MethodsThis investigation made use of a contrast detail (CD) phantom. Polymethyl methacrylate (PMMA) was utilised to approximate varied body part thicknesses (9, 11, 15 and 17 cm) simulating underweight, standard, overweight and obese patients, respectively. Different tube potentials were tested against a fixed 180 cm source to image distance (SID) and automatic exposure control (AEC). IQ was analysed using bespoke software thus providing an image quality figure inverse (IQFinv) value which represents LCD detectability. Dose area product (DAP) was utilised to represent the radiation dose.ResultsIQFinv values decreased statistically (P = 0.0001) with increasing phantom size across all tube potentials studied. The highest IQFinv values were obtained at 80 kVp for all phantom thicknesses (2.29, 2.02, 1.8 and 1.65, respectively). Radiation dose increased statistically (P = 0.0001) again with increasing phantom thicknesses.ConclusionOur findings demonstrate that lower tube potentials provide the highest IQFinv scores for various body part thicknesses. This is not consistent with professional practice because radiographers frequently raise the tube potential with increased part thickness. Higher tube potentials did result in radiation dose reductions. Establishing a balance between dose and IQ, which must be acceptable for diagnosis, can prevent the patient from receiving unnecessary additional radiation dose.

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Relationship between the visual evaluation of pathology visibility and the physical measure of low contrast detail detectability in neonatal chest radiography

Cited by 2 publications

References 28 publications

Improving input contrast estimation to an x-ray imaging system

Improving input contrast estimation to an x-ray imaging system

Effects of body part thickness on low‐contrast detail detection and radiation dose during adult chest radiography

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