This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article has been cited by other articles in PMC. Abstract The purpose of this paper is to identify indications for volumetric X-ray digital linear tomosynthesis DLT with single- and dual-energy subtraction techniques for artificial pulmonary nodule detection and compare X-ray DLT, X-ray digital radiography, and computed tomography.
Abstract The present study was performed to evaluate the potential for clinical application of digital linear tomosynthesis in imaging hip prostheses. Volumetric x-ray digital linear tomosysnthesis was used to image hip prostheses. The effectiveness of this method in enhancing visibility of a prosthesis case was quantified in terms of the signal-to-noise ratio SNRand removal of ghosting artifacts in a prosthesis case was quantified in terms of the artifact spread function ASF.
The order of ASF performance of the algorithm was as follows: The potential usefulness of digital linear tomosynthesis for evaluation of hip prostheses was demonstrated.
Further studies are required to determine the ability of digital linear tomosynthesis to quantify the spatial relationships between the metallic components of these devices as well as to identify bony changes with diagnostic consequences. Conventional tomography technology provides planar information of an object from its projection images.
In tomography, an x-ray tube and an x-ray film receptor move in opposite directions alongside the object. The relative motion of the tube and the film is predetermined based on the location of the in-focus plane.
In contrast, tomosynthesis acquires only one set of discrete x-ray projections, which can be used to reconstruct any plane of the object retrospectively. Unfortunately, backprojection alone leads to significant contrast-reducing tomographic blur from distant structures, imposed upon the reconstructed plane of interest.
As a noninvasive imaging technique, the use of CT has become essential, especially since the advent of spiral CT in the s, which led to shorter scan times and improved 3-dimensional 3D spatial resolution. CT provides high resolution in the tomographic plane, but limited resolution in the axial direction.
Therefore, the partial-volume effect may make it difficult to evaluate structures that are not oriented with the direction of the CT tomographic plane. However, the quality of images generated with a CT scanner can still be reduced by the presence of metal objects in the field of view FOV.
Imaging of patients with metal implants such as marker pins, dental fillings, or hip prostheses suffer from artifacts, generally in the form of bright and dark streaks, cupping, and capping; these artifacts are caused mostly by quantum noise, scattered radiation, and beam hardening.
These artifacts can make it extremely difficult or impossible to interpret images of these devices. These artifacts, along with the partial-volume effect, severely limit the potential for objective quantification of total joint replacements with CT.
Methods for reduction of metal artifacts aim to improve the quality of images affected by this type of artifacts.
In recent years, modified iterative 27 — 31 or wavelet reconstruction techniques 32 have produced promising results, but these methods cannot be combined with the fast and robust filtered backprojection FBP algorithm, which constitutes the standard reconstruction technique implemented in modern CT scanners.
In this report, we focus on the potential application of linear motion digital linear tomosynthesis using a modified FBP 3334 Gomi et al. The present study was performed to evaluate the clinical application of digital linear tomosynthesis in imaging hip prostheses using the relatively new commercial tomosynthesis from Shimadzu SonialVision Safire with a modified FBP algorithm.
This system consists of an x-ray tube 0. The x-ray collimator is shifted during acquisition to conform the x-ray illumination area to the detector. The motion of the collimator is synchronized with the motion of the tube.
An antiscatter grid was used.To examine the potential usefulness of digital linear tomosynthesis (Fig. 1) in replacing the CT, data were collected using a digital linear tomosynthesis system (SonialVision Safire; Shimadzu Co., Kyoto, Japan). This system consists of an x-ray tube (mm focal spot) and a × mm digital flat-panel detector (1, × 1, pixels, amorphous selenium) with μm pixel size.
(Specific to Discrete Procedures or Technologies) The medical director of Arkansas Blue Cross and Blue Shield has established specific coverage policies addressing certain medical procedures or technologies.
AAPM is the American Association of Physicists in Medicine. Prince Street Alexandria, VA Phone Fax Send general questions to PURPOSE: To describe and evaluate a method of tomosynthesis breast imaging with a full-field digital mammographic system. MATERIALS AND METHODS: In this tomosynthesis method, low-radiation-dose images were acquired as the x-ray source was moved in an .
CT scan can be used for detecting both acute and chronic changes in the lung parenchyma, that is, the internals of the lungs. It is particularly relevant here because normal two-dimensional X . Performing the Digital Mammography Examination · Positioning the Breast · Understanding Detector Field-of-View in Digital Mammography · Exposure Techniques.