&lt;title&gt;Full-leg/full-spine image stitching: a new and accurate CR-based imaging technique&lt;/title&gt;

Dewaele, Piet; Vuylsteke, P.; Velde, Sarah Van de; Schoeters, Emile P.

doi:10.1117/12.348529

Cited by 9 publications

(6 citation statements)

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“…Larger views (i.e. full spine or full leg) can be created by electronically pasting more than one single image [12,13]. If the detector is to be retrofitted in existing radiography installations, i.e.…”

Section: Important Properties Of Flat-panel Detectorsmentioning

confidence: 99%

Digital radiography with large-area flat-panel detectors

Kotter

Langer

2002

Eur Radiol

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Large-area flat-panel detectors with active readout mechanisms have been on the market for the past 2 years. This article describes different detector technologies. An important distinction is made between detectors with direct and those with indirect conversion of X-rays into electrical charges. Detectors with indirect conversion are built with unstructured or structured scintillators, the latter resulting in less lateral diffusion of emitted light. Some important qualities of flat-panel detectors are discussed. The first phantom and clinical studies published report an image quality at least comparable to that of screen-film systems and a potential for dose reduction. The available studies are summarised in this article.

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Section: Important Properties Of Flat-panel Detectorsmentioning

confidence: 99%

Digital radiography with large-area flat-panel detectors

Kotter

Langer

2002

Eur Radiol

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“…In the second system, images are acquired using overlapping standard film cassettes [12], which are digitized and then input to a computer that composes them. The setup requires placing a radiolucent plaque with a metal grid pattern parallel, close to the imaged anatomy, and on the X-ray path.…”

Section: Previous Workmentioning

confidence: 99%

Long Bone Panoramas From Fluoroscopic X-Ray Images

Yaniv

Joskowicz

2004

IEEE Trans. Med. Imaging

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Abstract-This paper presents a new method for creating a single panoramic image of a long bone from several individual fluoroscopic X-ray images. Panoramic images are useful preoperatively for diagnosis, and intraoperatively for long bone fragment alignment, for making anatomical measurements, and for documenting surgical outcomes. Our method composes individual overlapping images into an undistorted panoramic view that is the equivalent of a single X-ray image with a wide field of view. The correlations between the images are established from the graduations of a radiolucent ruler imaged alongside the long bone. Unlike existing methods, ours uses readily available hardware, requires a simple image acquisition protocol with minimal user input, and works with existing fluoroscopic C-arm units without modifications. It is robust and accurate, producing panoramas whose quality and spatial resolution is comparable to that of the individual images. The method has been successfully tested on in-vitro and clinical cases.Current orthopedic practice heavily relies on fluoroscopic X-ray images to perform a variety of surgical procedures such as fracture reduction, joint replacement, osteotomies, and pedicle screw insertion, to name a few. Surgeons use fluoroscopic X-ray images acquired during surgery with a mobile fluoroscopic C-arm to determine the relative position and orientation of bones, implants, and surgical instruments. While inexpensive and readily available, X-ray fluoroscopy has several important limitations, including a narrow field of view, limited resolution and contrast, and geometric distortion. These limitations require the surgeon to frequently acquire images of the surgical situation and to mentally correlate them. They preclude precise evaluation and measurements across images and complicate the placement of long implants. This leads to positioning errors, cumulative radiation exposure to the surgeon, and sub-optimal results in a small but nonnegligible number of cases.While modern X-ray units incorporate geometric distortion correction and contrast enhancement, only a handful address the narrow field of view issue, and only Siemens' is designed for intraoperative use [1], [2], [3]. In this paper, we describe a novel, simple, and inexpensive method for creating a single panoramic image from a few individual fluoroscopic X-ray images. Our method produces an undistorted panoramic view, which is the equivalent of a single X-ray image with a field of view several times wider than that of the individual images by finding correlations between individual overlapping images and composing them (Fig. 1). It uses standard, readily available, and inexpensive hardware: a video frame grabber, a standard PC, a dewarp grid, and a radiolucent X-ray ruler Manuscript

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“…This necessitates the supplemental post-processing step of digital image fusion. 14,15 Artefacts caused by image composition during this process occur if the images are not precisely aligned. 7 Initially, the process of image composition is fully automated.…”

Section: Introductionmentioning

confidence: 99%

Chimera of digital radiography in spine surgery: False diagnosis of implant failure

Salem

Ladenburger

Schoth

et al. 2019

Journal of Clinical Orthopaedics and Trauma

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Background: Digital radiographs of the whole spine are made using marginally superimposed imaging plates exposed simultaneously to be combined by interpolation of the overlapping area. Post-processing artefacts in these radiographs leading to the misdiagnosis of implant breakage have not yet been described in the literature. Methods: An erroneous fusion of a digital spine x-ray after scoliosis surgery created an image showing two broken rods, whereas both rods proved complete continuity intraoperatively. Following an interdisciplinary error analysis, the chain of errors was systematically reconstructed. Using the digital imaging material of patients operatively treated the same way; the reproducibility of the error was analyzed. Erroneous image fusions were produced by slight displacement of existing, not yet combined x-ray images of these patients. Results: Under certain requirements, the false impression of implant breakage could be reproduced. Especially in the case of missing or malpositioned radiopaque markers, the hazard to overlook an erroneous image fusion is present. Within the post-processing step performed by qualified staff, control is indispensable and manual correction can be crucial. Conclusions: This experimental study and causal analysis show the clinical relevance of post-processing artefacts in digital radiography. To prevent false diagnosis and maltreatment, the knowledge of possible sources of error is indispensable.

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<title>Full-leg/full-spine image stitching: a new and accurate CR-based imaging technique</title>

Cited by 9 publications

References 1 publication

Digital radiography with large-area flat-panel detectors

Digital radiography with large-area flat-panel detectors

Long Bone Panoramas From Fluoroscopic X-Ray Images

Chimera of digital radiography in spine surgery: False diagnosis of implant failure

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