Robert Bujila
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View article: Effect of Patient Positioning on CT Number Accuracy: A Phantom Study Comparing Energy Integrating and Deep Silicon Photon Counting Detector CT
Effect of Patient Positioning on CT Number Accuracy: A Phantom Study Comparing Energy Integrating and Deep Silicon Photon Counting Detector CT Open
Objective: Patient positioning during clinical practice can be challenging, and mispositioning leads to a change in CT number. CT number fluctuation was assessed in single-energy (SE) EID, dual-energy (DE) EID, and deep silicon photon-coun…
View article: Initial Clinical Images From a Second-Generation Prototype Silicon-Based Photon-Counting Computed Tomography System
Initial Clinical Images From a Second-Generation Prototype Silicon-Based Photon-Counting Computed Tomography System Open
This initial study demonstrates that routine imaging at clinically appropriate patient exposure levels is feasible using a novel deep-silicon photon-counting detector CT system. Furthermore, a deep-silicon detector may provide a balanced a…
View article: CT Number Accuracy and Association With Object Size: A Phantom Study Comparing Energy-Integrating Detector CT and Deep Silicon Photon-Counting Detector CT
CT Number Accuracy and Association With Object Size: A Phantom Study Comparing Energy-Integrating Detector CT and Deep Silicon Photon-Counting Detector CT Open
BACKGROUND. Variable beam hardening based on patient size causes variation in CT numbers for energy-integrating detector (EID) CT. Photon-counting detector (PCD) CT more accurately determines effective beam energy, potentially improving CT…
View article: Academic achievement after a CT examination toward the head in childhood: Follow up of a randomized controlled trial
Academic achievement after a CT examination toward the head in childhood: Follow up of a randomized controlled trial Open
Introduction Increasing use of CT examinations has led to concerns of possible negative cognitive effects for children. The objective of this study is to examine if the ionizing radiation dose from a CT head scan at the age of 6–16 years a…
View article: Photon count rates estimated from 1980 clinical CT scans
Photon count rates estimated from 1980 clinical CT scans Open
Background All photon counting detectors have a characteristic count rate over which their performance degrades. Degradation in the clinical setting takes the form of increased noise, reduced material quantification accuracy, and image art…
View article: Technical Note: SpekPy v2.0—a software toolkit for modeling x‐ray tube spectra
Technical Note: SpekPy v2.0—a software toolkit for modeling x‐ray tube spectra Open
Purpose SpekPy is a free toolkit for modeling x‐ray tube spectra with the Python programming language. In this article, the advances in version 2.0 (v2) of the software are described, including additional target materials and more accurate…
View article: Methods and utilities to assist in the optimization of image quality and radiation dose in X-ray Computed Tomography
Methods and utilities to assist in the optimization of image quality and radiation dose in X-ray Computed Tomography Open
X-ray Computed Tomography (CT) is a highly utilized tool in diagnos- tic radiology. CT provides radiologists with unobstructed views of patient anatomy. However, image quality in CT is highly dependent on the imaging task, scan technique, …
View article: Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning
Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning Open
Photon-counting detectors are expected to bring a range of improvements to patient imaging with x-ray computed tomography (CT). One is higher spatial resolution. We demonstrate the resolution obtained using a commercial CT scanner where th…
View article: Ultra-low-dose CT for extremities in an acute setting: initial experience with 203 subjects
Ultra-low-dose CT for extremities in an acute setting: initial experience with 203 subjects Open
Objective The purpose of this study was to assess if ultra-low-dose CT is a useful clinical alternative to digital radiographs in the evaluation of acute wrist and ankle fractures. Materials and methods An ultra-low-dose protocol was desig…
View article: Applying three different methods of measuring <i>CTDI</i><sub><i>free air</i></sub> to the extended <scp>CTDI</scp> formalism for wide‐beam scanners (<scp>IEC</scp> 60601–2–44): A comparative study
Applying three different methods of measuring <i>CTDI</i><sub><i>free air</i></sub> to the extended <span>CTDI</span> formalism for wide‐beam scanners (<span>IEC</span> 60601–2–44): A comparative study Open
Purpose The weighted CT dose index ( CTDI w ) has been extended for a nominal total collimation width ( nT ) greater than 40 mm and relies on measurements of . The purpose of this work was to compare three methods of measuring and subseque…