Browsing by Author "Ria, Francesco"
Now showing items 1-20 of 29
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A comparison of COVID-19 and imaging radiation risk in clinical patient populations.
(J Radiol Prot, 2020-10-07)OBJECTIVE: The outbreak of coronavirus SARS-COV2 affected more than 180 countries necessitating fast and accurate diagnostic tools. Reverse transcriptase polymerase chain reaction (RT-PCR) has been identified as a gold standard ... -
A database of 40 patient-based computational models for benchmarking organ dose estimates in CT.
(Medical physics, 2020-07-06)PURPOSE:Patient radiation burden in CT can best be characterized through risk estimates derived from organ doses. Organ doses can be estimated by Monte Carlo simulations of the CT procedures on computational phantoms assumed ... -
A mathematical framework to quantitatively balance clinical and radiation risk in Computed Tomography
(2021-12-01)Purpose: Risk in medical imaging is a combination of radiation risk and clinical risk, which is largely driven by the effective diagnosis. While radiation risk has traditionally been the main focus of Computed Tomography ... -
Classification of COVID-19 in chest radiographs: assessing the impact of imaging parameters using clinical and simulated images
(Medical Imaging 2021: Computer-Aided Diagnosis, 2021-02-15)As computer-aided diagnostics develop to address new challenges in medical imaging, including emerging diseases such as COVID-19, the initial development is hampered by availability of imaging data. Deep learning algorithms ... -
Clinical Decision Making in CT: Risk Assessment Comparison Across 12 Risk Metrics in Patient Populations
(Journal of Medical Physics, 2020-06-30)Purpose The Medical Physics 3.0 initiative aims to enhance direct physicist involvement in clinical decision making to improve patient care. In this involvement, it is crucial to achieve effective and patient-specific radiation ... -
Clinical Decision Making in CT: Risk Assessment Comparison Across 12 Risk Metrics in Patient Populations
(Journal of Medical Physics, 2020-06-30)Purpose The Medical Physics 3.0 initiative aims to enhance direct physicist involvement in clinical decision making to improve patient care. In this involvement, it is crucial to achieve effective and patient-specific radiation ... -
Comparison of 12 surrogates to characterize CT radiation risk across a clinical population.
(European radiology, 2021-02-23)<h4>Objectives</h4>Quantifying radiation burden is essential for justification, optimization, and personalization of CT procedures and can be characterized by a variety of risk surrogates inducing different radiological ... -
Deep learning classification of COVID-19 in chest radiographs: performance and influence of supplemental training
(Journal of Medical Imaging, 2021-12-01) -
Dose coefficients for organ dosimetry in tomosynthesis imaging of adults and pediatrics across diverse protocols.
(Medical physics, 2022-06-11)<h4>Purpose</h4>The gold-standard method for estimation of patient-specific organ doses in digital tomosynthesis (DT) requires protocol-specific Monte Carlo (MC) simulations of radiation transport in anatomically accurate ... -
Estimation of in vivo noise in clinical CT images: comparison and validation of three different methods against ensemble noise gold-standard
(Proc. SPIE 11595, Medical Imaging 2021: Physics of Medical Imaging, 115952P, 2021-02-15)Image quality estimation is crucial in modern CT with noise magnitude playing a key role. Several methods have been proposed to estimate noise surrogates in vivo. This study aimed to ascertain the accuracy of three different ... -
Expanding the Concept of Diagnostic Reference Levels to Noise and Dose Reference Levels in CT.
(AJR. American journal of roentgenology, 2019-06-10)OBJECTIVE. Diagnostic reference levels were developed as guidance for radiation dose in medical imaging and, by inference, diagnostic quality. The objective of this work was to expand the concept of diagnostic reference ... -
Image noise and dose performance across a clinical population: patient size adaptation as a metric of CT performance.
(Med Phys, 2017-02-24)PURPOSE: Modern CT systems adjust x-ray flux accommodating for patient size to achieve certain image noise values. The effectiveness of this adaptation is an important aspect of CT performance and should ideally be characterized ... -
Justification of radiological procedures in COVID-19 pandemic based on radiation risk only
(2020-12-02)Purpose. Radiologic procedures are recommended based on benefit-to-risk justification. In X-ray imaging, while the benefit is often immediate for the patient, the associated radiation burden risk is a longer-term effect. ... -
Modeling Patient-Informed Liver Contrast Perfusion in Contrast-enhanced Computed Tomography.
(J Comput Assist Tomogr, 2020-11)OBJECTIVE: To determine the correlation between patient attributes and contrast enhancement in liver parenchyma and demonstrate the potential for patient-informed prediction and optimization of contrast enhancement in liver ... -
Organ doses and cancer risk assessment in patients exposed to high doses from recurrent CT exams
(European Journal of Radiology, 2022-04) -
Organ doses from CT localizer radiographs: Development, validation, and application of a Monte Carlo estimation technique
(MEDICAL PHYSICS, 2019-11-01) -
Organ Doses from CT Localizer Radiographs: Development, Validation, and Application of a Monte Carlo Estimation Technique.
(Medical physics, 2019-08-23)PURPOSE:The purpose of this study was to simulate and validate organ doses from different CT localizer radiograph geometries using Monte Carlo methods for a population of patients. METHODS:A Monte Carlo method was developed ... -
Organ-based and DLP-based effective dose as representations of radiation risk in a population of 8946 patients with cumulative effective dose greater than 100 mSv
(2021-12-01)Purpose. Recent studies have shown that it is not uncommon for a patient to undergo multiple CT exams resulting in high cumulative dose above 100 mSv, the radiation risk associated with which is not negligible. The purpose ... -
Patient-informed modelling of hepatic contrast dynamics in contrast-enhanced CT imaging
(Medical Imaging 2020: Physics of Medical Imaging, 2020-03-16)PURPOSE Iodinated contrast agents are commonly used in CT imaging to enhance tissue contrast. Consistency in contrast enhancement (CE) is critical in radiological diagnosis. Contrast material circulation in individual patients ...
