Abstract:
PURPOSE:To quantify the impact of prosthesis material and design on the reduction of metal artefacts in total hip arthroplasties using virtual monochromatic dual-layer detector Spectral CT imaging. METHODS:The water-filled total hip arthroplasty phantom was scanned on a novel 128-slice Philips IQon dual-layer detector Spectral CT scanner at 120-kVp and 140-kVp at a standard computed tomography dose index of 20.0mGy. Several unilateral and bilateral hip prostheses consisting of different metal alloys were inserted and combined which were surrounded by 18 hydroxyapatite calcium carbonate pellets representing bone. Images were reconstructed with iterative reconstruction and analysed at monochromatic energies ranging from 40 to 200keV. CT numbers in Hounsfield Units (HU), noise measured as the standard deviation in HU, signal-to-noise-ratios (SNRs) and contrast-to-noise-ratios (CNRs) were analysed within fixed regions-of-interests placed in and around the pellets. RESULTS:In 70 and 74keV virtual monochromatic images the CT numbers of the pellets were similar to 120-kVp and 140-kVp polychromatic results, therefore serving as reference. A separation into three categories of metal artefacts was made (no, mild/moderate and severe) where pellets were categorized based on HU deviations. At high keV values overall image contrast was reduced. For mild/moderate artefacts, the highest average CNRs were attained with virtual monochromatic 130keV images, acquired at 140-kVp. Severe metal artefacts were not reduced. In 130keV images, only mild/moderate metal artefacts were significantly reduced compared to 70 and 74keV images. Deviations in CT numbers, noise, SNRs and CNRs due to metal artefacts were decreased with respectively 64%, 57%, 62% and 63% (p<0.001) compared to unaffected pellets. Optimal keVs, based on CNRs, for different unilateral and bilateral metal hip prostheses consisting of different metal alloys varied from 74 to 150keV. The Titanium alloy resulted in less severe artefacts and were reduced more effectively compared to the Cobalt alloy. CONCLUSIONS:Virtual monochromatic dual-layer Spectral CT imaging results in a significant reduction of streak artefacts produced by beam-hardening in mild and moderate artefacts by improving CT number accuracy, SNRs and CNRs, while decreasing noise values in a total hip arthroplasty phantom. An optimal monochromatic energy of 130keV was found ranging from 74keV to 150keV for different unilateral and bilateral hip prostheses consisting of different metal alloys.
journal_name
Eur J Radioljournal_title
European journal of radiologyauthors
Wellenberg RH,Boomsma MF,van Osch JA,Vlassenbroek A,Milles J,Edens MA,Streekstra GJ,Slump CH,Maas Mdoi
10.1016/j.ejrad.2017.01.002subject
Has Abstractpub_date
2017-03-01 00:00:00pages
61-70eissn
0720-048Xissn
1872-7727pii
S0720-048X(17)30002-5journal_volume
88pub_type
杂志文章abstract:AIM:Positron emission tomography (PET) using F18-flurodeoxy-glucose (FDG) has been widely used for reflecting cellular metabolism. However, the feasibility of FDG PET in the diagnosis of hepatocellular carcinoma (HCC) is limited. The aim of the study was to assess the ability of FDG PET (PET/CT) in the detection of ext...
journal_title:European journal of radiology
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.ejrad.2011.08.004
更新日期:2012-09-01 00:00:00
abstract:PURPOSE:Distinguishing between enchondromas and low-grade (grade 1) chondrosarcomas can be challenging. The aim of this study was to investigate the role of Thallium-201 scintigraphy and Technetium-99 m pentavalent dimercaptosuccinic acid (Tc-99 m DMSA (V)) in the diagnosis and grading of chondrosarcomas. METHODS:232 ...
journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2020.108846
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abstract::The use of chest computed tomography (CT) as an imaging test for the evaluation of thoracic pathology has significantly increased during the last four decades. Although cardiopulmonary diseases often overlap in their clinical manifestation, radiologists tend to overlook the heart while interpreting routine chest CT. R...
journal_title:European journal of radiology
pub_type: 杂志文章,评审
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abstract:AIM:The aim of the present study was to investigate the diagnostic and prognostic value of combined (18)F-2-fluorodeoxyglucose positron emission tomography and contrast enhanced X-ray computed tomography (FDG-PET/CT) in women with a suspicion of recurrent ovarian cancer. PATIENTS AND METHODS:We retrospectively reviewe...
journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 杂志文章
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更新日期:2017-10-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2006.02.006
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pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 临床试验,杂志文章
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更新日期:1995-03-01 00:00:00
abstract:PURPOSE:To assess radiotherapy (RT)-induced changes in the urethra and periurethral tissues after treatment for prostate cancer (PCa). METHODS AND MATERIALS:This retrospective study included 108 men (median age, 64 years; range, 43-87 years) who received external-beam radiotherapy (EBRT) and/or brachytherapy for PCa a...
journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2011.06.035
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2014.02.013
更新日期:2014-05-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章,评审
doi:10.1016/j.ejrad.2005.12.007
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/s0720-048x(01)00385-0
更新日期:2001-12-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章,评审
doi:10.1016/j.ejrad.2011.04.010
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2009.01.015
更新日期:2010-04-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章,评审
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2009.05.035
更新日期:2010-06-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章
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更新日期:2018-01-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章
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更新日期:2014-04-01 00:00:00
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pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2019.02.026
更新日期:2019-04-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/0720-048x(96)01060-1
更新日期:1996-09-01 00:00:00
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journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 杂志文章
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journal_title:European journal of radiology
pub_type: 杂志文章
doi:10.1016/j.ejrad.2010.08.020
更新日期:2011-12-01 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2014-04-01 00:00:00