Ms Katy Szczepura's Outputs (60)

Analysis of effective and organ dose estimation in CT when using mA modulation : a single scanner pilot study (2017)
Journal Article
Tootell, A., Szczepura, K., & Hogg, P. (2017). Analysis of effective and organ dose estimation in CT when using mA modulation : a single scanner pilot study. Radiography, 23(2), 159-166. https://doi.org/10.1016/j.radi.2017.02.006

Effective dose (ED) estimation in CT examinations can be obtained by combining dose length product (DLP) with published ED per DLP coefficients or performed using software. These methods do not account for tube current (mA) modulation which is influe... Read More about Analysis of effective and organ dose estimation in CT when using mA modulation : a single scanner pilot study.

Impact of tube current modulation on nodule conspicuity index in hi-resolution chest computed tomography (2017)
Presentation / Conference
Szczepura, K., Tomkinson, D., & Manning, D. (2017, February). Impact of tube current modulation on nodule conspicuity index in hi-resolution chest computed tomography. Presented at SPIE Medical Imaging 2017 : Image Perception, Observer Performance, and Technology Assessment, Orlando, Florida, USA

Effective dose and effective risk from post-SPECT imaging of the lumbar spine (2016)
Journal Article

Purpose
Planar bone scans play an important role in the staging and monitoring of malignancy and metastases. Metastases in the lumbar spine are associated with significant morbidity, therefore accurate diagnosis is essential. Supplementary imaging... Read More about Effective dose and effective risk from post-SPECT imaging of the lumbar spine.

Validated novel software to measure the conspicuity index of lesions in DICOM images (2016)
Journal Article

Description of purpose
A novel software programme and associated Excel spreadsheet has been developed to provide an objective measure of the expected visual detectability of focal abnormalities within DICOM images.
Methodology
ROIs are drawn ar... Read More about Validated novel software to measure the conspicuity index of lesions in DICOM images.

Effect of reconstruction methods and x-ray tube current-time product on nodule detection in an anthropomorphic thorax phantom : a crossed-modality JAFROC observer study (2016)
Journal Article

Purpose: To evaluate nodule detection in an anthropomorphic chest phantom in computed tomography (CT) images reconstructed with adaptive iterative dose reduction 3D (AIDR3D) and filtered back projection (FBP) over a range of tube current-time product... Read More about Effect of reconstruction methods and x-ray tube current-time product on nodule detection in an anthropomorphic thorax phantom : a crossed-modality JAFROC observer study.

Does elevating image receptor increase breast receptor footprint and improve pressure balance? (2015)
Journal Article

There is no consensus in the literature regarding the image receptor (IR) position for the cradio-caudal
projection in mammography. Some literature indicates the IR should be positioned to the infra mammary
fold (IMF); other literature suggests the... Read More about Does elevating image receptor increase breast receptor footprint and improve pressure balance?.

A phantom-based JAFROC observer study of two CT reconstruction methods : the search for optimisation of lesion detection and effective dose (2015)
Journal Article

Purpose: To investigate the dose saving potential of iterative reconstruction (IR) in a computed tomography (CT) examination of the thorax.
Materials and Methods: An anthropomorphic chest phantom containing various configurations of simulated lesi... Read More about A phantom-based JAFROC observer study of two CT reconstruction methods : the search for optimisation of lesion detection and effective dose.

Comparison of effective dose and lifetime risk of cancer Incidence of CT attenuation correction acquisitions and radiopharmaceutical administration for myocardial perfusion imaging (2014)
Journal Article

Objective: To measure the organ dose and calculate effective dose from CT attenuation correction (CTAC) acquisitions from four commonly used gamma camera single photon emission CT/CT systems.

Methods: CTAC dosimetry data was collected using therm... Read More about Comparison of effective dose and lifetime risk of cancer Incidence of CT attenuation correction acquisitions and radiopharmaceutical administration for myocardial perfusion imaging.

A 6 year study of mammographic compression force : practitioner variability within and between screening sites (2014)
Journal Article

Background
The application of compression force in mammography is more heavily influenced by the practitioner rather than the client. This can affect client experience, radiation
dose and image quality. This research investigates practitioner comp... Read More about A 6 year study of mammographic compression force : practitioner variability within and between screening sites.

An overview of measuring and modelling dose and risk from ionising radiation for medical exposures (2014)
Journal Article

PURPOSE: This paper gives an overview of the methods that are used to calculate dose and risk from exposure to ionizing radiation as a support to other papers in this special issue.
BACKGROUND: The optimization of radiation dose is a legal requir... Read More about An overview of measuring and modelling dose and risk from ionising radiation for medical exposures.

An audit to investigate the impact of false positive breast screening results and diagnostic work-up on re-engagement with subsequent routine screening (2014)
Journal Article
Nightingale, J., Borgen, R., Porter-Bennett, L., & Szczepura, K. (2014). An audit to investigate the impact of false positive breast screening results and diagnostic work-up on re-engagement with subsequent routine screening. Radiography, 21(1), 7-10. https://doi.org/10.1016/j.radi.2014.05.005

Introduction: Women attending breast screening may have suspicious mammographic findings that are subsequently found at assessment clinic to be normal (false positive, FP). A false positive diagnosis is not harmless, with short and long term negativ... Read More about An audit to investigate the impact of false positive breast screening results and diagnostic work-up on re-engagement with subsequent routine screening.

Breast tissue bulge and lesion visibility during stereotactic biopsy – a phantom study (2014)
Journal Article
Williams, S., Hackney, L., Hogg, P., & Szczepura, K. (2014). Breast tissue bulge and lesion visibility during stereotactic biopsy – a phantom study. Radiography, 20(3), 271-276. https://doi.org/10.1016/j.radi.2014.04.006

Background

During mammography guided stereotactic breast biopsy a bulge of tissue can form in the paddle needle biopsy aperture. This bulge has been estimated to have a height of up to 30% of the breast itself. During clinical biopsy we have noti... Read More about Breast tissue bulge and lesion visibility during stereotactic biopsy – a phantom study.

A free-response evaluation determining value in the computed tomography attenuation correction image for revealing pulmonary incidental findings : a phantom study (2014)
Journal Article
Thompson, J., Hogg, P., Manning, D., Szczepura, K., & Chakraborty, D. (2014). A free-response evaluation determining value in the computed tomography attenuation correction image for revealing pulmonary incidental findings : a phantom study. Academic radiology, 21(4), 538-545. https://doi.org/10.1016/j.acra.2014.01.003

RATIONALE AND OBJECTIVES: The purpose of this study was to compare lesion-detection performance when interpreting computed tomography (CT) images that are acquired for attenuation correction when performing single photon emission computed tomography/... Read More about A free-response evaluation determining value in the computed tomography attenuation correction image for revealing pulmonary incidental findings : a phantom study.

Radionuclide Metabolic Therapy (2013)
Book

Fact or fiction : an analysis of the 10 kVp ‘rule’ in computed radiography (2013)
Journal Article
radiography. Radiography, 19(3), 223-227. https://doi.org/10.1016/j.radi.2013.05.003

Purpose: To determine whether increasing the tube voltage by 10 kVp whilst reducing the tube current by
50% (10 kVp ‘rule’) produces similar perceptual image quality.
Method: 391 matched pairs of anthropomorphic chest phantom X-ray images were pro... Read More about Fact or fiction : an analysis of the 10 kVp ‘rule’ in computed radiography.

Tissue bulge during stereotactic core biopsy (2013)
Journal Article
Hackney, L., Williams, S., Hogg, P., & Szczepura, K. (2013). Tissue bulge during stereotactic core biopsy. Radiography, 19(4), 366-368. https://doi.org/10.1016/j.radi.2013.06.007

In full field digital mammography (FFDM) the whole breast is subjected to compression with a perspex compression paddle in order to reduce breast thickness and improve image quality. Once a mammographic abnormality has been detected using FFDM and a... Read More about Tissue bulge during stereotactic core biopsy.

Practitioner compression force variation in mammography : a 6 year study (2013)
Journal Article

The application of breast compression in mammography may be more heavily influenced by the practitioner
rather than the client. This could affect image quality and will affect client experience. This study builds on
previous research to establish i... Read More about Practitioner compression force variation in mammography : a 6 year study.

A method to measure paddle and detector pressures and footprints in mammography (2013)
Journal Article
Hogg, P., Szczepura, K., Darlington, A., & Maxwell, A. (2013). A method to measure paddle and detector pressures and footprints in mammography. Medical Physics, 40(4), 041907. https://doi.org/10.1118/1.4792720

Purpose:
Compression is necessary in mammography to improve image quality and reduce radiation burden. Maximizing the amount of breast in contact with the image receptor (IR) is important. To achieve this, for the craniocaudal projection, there is n... Read More about A method to measure paddle and detector pressures and footprints in mammography.

Optimising the number of thermoluminescent dosimeters required for the measurement of effective dose for computed tomography attenuation correction data in SPECT/CT myocardial perfusion imaging (2013)
Journal Article
Tootell, A., Szczepura, K., & Hogg, P. (2013). Optimising the number of thermoluminescent dosimeters required for the measurement of effective dose for computed tomography attenuation correction data in SPECT/CT myocardial perfusion imaging. Radiography, 19(1), 42-47. https://doi.org/10.1016/j.radi.2012.11.001

Background

The use of thermoluminescent dosimeters (TLDs) is regarded as time consuming and laborious. As part of our dosimetry research it was necessary to optimise the use of our resources, both physical and time. Experimental work was carried... Read More about Optimising the number of thermoluminescent dosimeters required for the measurement of effective dose for computed tomography attenuation correction data in SPECT/CT myocardial perfusion imaging.

Pressure and breast thickness in mammography : an exploratory calibration study (2013)
Journal Article
Hogg, P., Taylor, M., Szczepura, K., Mercer, C., & Denton, E. (2013). Pressure and breast thickness in mammography : an exploratory calibration study. British Journal of Radiology, 86(1021), 1-7. https://doi.org/10.1259/bjr.20120222

Objective To perform a calibration study to provide data to help improve consistency in the pressure that is applied during mammography.

Methods Automatic readouts of breast thickness accuracy vary between mammography machines; therefore, one m... Read More about Pressure and breast thickness in mammography : an exploratory calibration study.