Metallic Artifacts From Internal Scaphoid Fracture Fixation Screws

Finkenstaedt, Tim; Morsbach, Fabian; Calcagni, Maurizio; Vich, Magdalena; Pfirrmann, Christian W. A.; Alkadhi, Hatem; Runge, Val M.; Andreisek, Gustav; Guggenberger, Roman

doi:10.1097/rli.0000000000000052

Cited by 23 publications

(6 citation statements)

References 30 publications

(29 reference statements)

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“…From a technical point of view, FPCT imaging should result in more artifacts than MDCT imaging because of the technical set-up and a higher amount of scatter radiation. 17 Consecutively, the majority of papers reports more artifacts in FPCT compared with MDCT, 4 , 5 , 18 although few data suggest different results. 19 , 20 These diverging results can probably be explained due to differences in density, configuration, and positioning of the tested material.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of Multidetector Computed Tomography and Flat-Panel Computed Tomography Regarding Visualization of Cortical Fractures, Cortical Defects, and Orthopedic Screws

et al. 2015

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To compare the visualization of cortical fractures, cortical defects, and orthopedic screws in a dedicated extremity flat-panel computed tomography (FPCT) scanner and a multidetector computed tomography (MDCT) scanner.We used feet of European roe deer as phantoms for cortical fractures, cortical defects, and implanted orthopedic screws. FPCT and MDCT scans were performed with equivalent dose settings. Six observers rated the scans according to number of fragments, size of defects, size of defects opposite orthopedic screws, and the length of different screws. The image quality regarding depiction of the cortical bone was assessed. The gold standard (real number of fragments) was evaluated by autopsy.The correlation of reader assessment of fragments, cortical defects, and screws with the gold standard was similar for FPCT and MDCT. Three readers rated the subjective image quality of the MDCT to be higher, whereas the others showed no preferences.Although the image quality was rated higher in the MDCT than in the FPCT by 3 out of 6 observers, both modalities proved to be comparable regarding the visualization of cortical fractures, cortical defects, and orthopedic screws and of use to musculoskeletal radiology regarding fracture detection and postsurgical evaluation in our experimental setting.

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Section: Discussionmentioning

confidence: 99%

“…It was found that MDCT has a higher contrast resolution, produces fewer image artifacts, and has a lower scan time. 4 , 5 Nonetheless, the FPCT provides a higher spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Multidetector Computed Tomography and Flat-Panel Computed Tomography Regarding Visualization of Cortical Fractures, Cortical Defects, and Orthopedic Screws

et al. 2015

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“…During the past years flat panel detector CT within the angiography suite has increasingly been used to rule out peri-interventional complications such as intracranial hemorrhage or to visualize implanted materials, and also to serve as a non-invasive method for high-resolution imaging of cerebrovascular structures and pathologies during follow-up. 4–7 Since metal artifacts strongly limit the diagnostic value of follow-up studies after clipping or coiling, and also in other fields of radiology, 8 9 the introduction of algorithms for metal artifact reduction (MAR) was an important step forward in providing images of diagnostic value in patients with metallic implants. 10 11 …”

Section: Introductionmentioning

confidence: 99%

Metal artifact reduction for flat panel detector intravenous CT angiography in patients with intracranial metallic implants after endovascular and surgical treatment

Pjontek

Önenköprülü

Scholz

et al. 2015

J NeuroIntervent Surg

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BackgroundFlat panel detector CT angiography with intravenous contrast agent injection (IV CTA) allows high-resolution imaging of cerebrovascular structures. Artifacts caused by metallic implants like platinum coils or clips lead to degradation of image quality and are a significant problem.ObjectiveTo evaluate the influence of a prototype metal artifact reduction (MAR) algorithm on image quality in patients with intracranial metallic implants.MethodsFlat panel detector CT after intravenous application of 80 mL contrast agent was performed with an angiography system (Artis zee; Siemens, Forchheim, Germany) using a 20 s rotation protocol (200° rotation angle, 20 s acquisition time, 496 projections). The data before and after MAR of 26 patients with a total of 34 implants (coils, clips, stents) were independently evaluated by two blinded neuroradiologists.ResultsMAR improved the assessability of the brain parenchyma and small vessels (diameter <1 mm) in the neighborhood of metallic implants and at a distance of 6 cm (p<0.001 each, Wilcoxon test). Furthermore, MAR significantly improved the assessability of parent vessel patency and potential aneurysm remnants (p<0.005 each, McNemar test). MAR, however, did not improve assessability of stented vessels.ConclusionsWhen an intravenous contrast protocol is used, MAR significantly ameliorates the assessability of brain parenchyma, vessels, and treated aneurysms in patients with intracranial coils or clips.

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“…5,29,30 However, when metallic components are present in the bones studied, standard-dose CT scans have better image quality, with fewer artifacts, than lowdose CT scans. 31…”

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confidence: 99%

Computed tomography with low-dose radiation versus standard-dose radiation for diagnosing fractures: systematic review and meta-analysis

Duarte¹,

Santos

Oliveira

et al. 2021

Sao Paulo Med. J.

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Ionizing radiation such as X-rays is a singular form of energy that surmounts the binding energy of electrons that orbit atoms and molecules. 1 In biological material exposed to X-rays, the most common consequential scenario is that this creates hydroxyl radicals from interactions between X-rays and water molecules. These radicals, in turn, interact with deoxyribonucleic acid (DNA) to cause breakage of bonds or damage to the base. 1 Thus, mutations, chromosomal translocations and fusions between genes can occur, which in some cases may lead to cancer. 1 All X-ray-based imaging methods have the characteristic in common of a trade-off between image quality and radiation dose, since all forms of ionizing radiation can damage tissues. 2 In patients undergoing radiographic and/or tomographic monitoring, the patient's exposure to radiation needs to be considered, and this poses a challenge to radiologists regarding dose reduction. 3,4 The main concern in diagnostic imaging is that a stochastic lesion of radiation-induced cancer could develop, which can occur with any radiation dose. [5][6][7] Conversely, deterministic effects occur only when the threshold has been exceeded and, above that, the incidence and severity of the injury increase with the radiation dose. 6,7 It also needs to be taken into account that the pediatric population is 10 times more sensitive to radiation than adults. 8 To date, no safe dose of ionizing radiation, below which there is no risk of cell damage and subsequent risk of cancer, has been established. 9,10 However, it has been estimated in the United States that about 1.5%-2.0% of all malignancies can be attributed to radiation from computed tomography (CT) scans. 1,6 Taking all imaging examinations into account, this proportion ranges

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Metallic Artifacts From Internal Scaphoid Fracture Fixation Screws

Cited by 23 publications

References 30 publications

Comparison of Multidetector Computed Tomography and Flat-Panel Computed Tomography Regarding Visualization of Cortical Fractures, Cortical Defects, and Orthopedic Screws

Comparison of Multidetector Computed Tomography and Flat-Panel Computed Tomography Regarding Visualization of Cortical Fractures, Cortical Defects, and Orthopedic Screws

Metal artifact reduction for flat panel detector intravenous CT angiography in patients with intracranial metallic implants after endovascular and surgical treatment

Computed tomography with low-dose radiation versus standard-dose radiation for diagnosing fractures: systematic review and meta-analysis

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