Correction for Resolution Nonuniformities Caused by Anode Angulation in Computed Tomography

Validation of computed tomography-based attenuation correction of deviation between theoretical and actual values for four computed tomography scanners

Objective: In this study, we aimed to validate the accuracy of computed tomography-based attenuation correction (CTAC) using the bilinear scaling method.Methods: The measured attenuation coefficient (μm) was compared to a theoretical attenuation coefficient (μt ) using four different CT scanners and an RMI 467 phantom. The effective energy of the CT beam X-rays was calculated, using the aluminu...

Hepatic computed tomography changes caused by amiodarone

An 80-year-old woman who had undergone aortic valve replacement for aortic valve stenosis was hospitalized for congestive heart failure and paroxysmal atrial fibrillation 4 years prior to the current presentation. At that time, she started receiving oral amiodarone, and she took amiodarone for 4 years. She visited our hospital because dementia had progressed over the previous 2 months, leaving ...

High Resolution Computed Tomography

High Resolution Computed Tomography

High-resolution computed tomography

This paper investigates high-resolution reconstructions from eeciently sampled data in parallel-beam tomography, in particular local tomography. A class of sampling schemes is deened and characterized, and it is shown that the standard scheme and the interlaced scheme of Cormack are most promising. An error analysis for the ltered backprojection algorithm for both global and local tomography is...