MRI quality assurance using the ACR phantom in a multi-unit imaging center

Ihalainen, Toni; Lönnroth, Nadja Teresia; Peltonen, Juha; Uusi-Simola, Jouni; Timonen, Marjut; Kuusela, Linda; Savolainen, Sauli; Sipilä, O.

doi:10.3109/0284186x.2011.582515

Cited by 66 publications

(62 citation statements)

References 12 publications

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“…There have been a number of publications of the ACR phantom test conducted on diagnostic MRI scanners (10)(11)(12)(13)(14) for diagnostic MRI QA/QC purpose, while the reports of ACR phantom test on dedicated MR-sim are still sparse (15). Our results showed that ACR phantom image acquired on a 1.5T dedicated MR-sim generally had sufficiently good image quality to pass all ACR recommended criteria, under a compromised flexible coil setting, thus fulfilled the basic requirements for clinical service.…”

Section: Discussionmentioning

confidence: 99%

Image quality assessment of a 1.5T dedicated magnetic resonance-simulator for radiotherapy with a flexible radio frequency coil setting using the standard American College of Radiology magnetic resonance imaging phantom test

Wong

Yuan

et al. 2017

Quant. Imaging Med. Surg.

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Background: A flexible RF coil setting has to be used on an MR-simulator (MR-sim) in the head and neck simulation scan for radiotherapy (RT) purpose, while the image quality might be compromised due to the sub-optimized flexible coil compared to the normal diagnostic radiological (DR) head coil. In this study, we assessed the image quality of an MR-sim by conducting the standard American College of Radiology (ACR)MRI phantom test on a 1.5T MR-sim under RT-setting and comparing it to DR-setting.Methods: A large ACR MRI phantom was carefully positioned, aligned and scanned 9 times for each under RT-and DR-setting on a 1.5T MR-sim, following the ACR scanning instruction. Images were analyzed following the ACR guidance. Measurement results under two coil settings were quantitatively compared.Inter-observer disagreements under RT-setting between two physicists were compared using Bland-Altman (BA) analysis and intra-class correlation coefficient (ICC). Results:The MR-sim with RT-setting obtained sufficiently good image quality to pass all ACR recommended criteria. No significant difference was found in phantom length accuracy, high-contrast spatial resolution, slice thickness accuracy, slice position accuracy, and percent-signal ghosting. RT-setting significantly under-performed in low-contrast object detectability, while better performed in image intensity uniformity. BA analysis showed that 95% limit of agreement and biases of phantom test measurement under RT-setting between two observers were very small. Excellent inter-observer agreement (ICC >0.75) was achieved in all measurements except for slice thickness accuracy (ICC =0.42, moderate agreement) under RT-setting.Conclusions: Very good and highly reproducible image quality could be achieved on a 1.5T MR-sim with a flexible coil setting as revealed by the standard ACR MRI phantom test. The flexible RT-setting compromised in image signal-to-noise ratio (SNR) compared to the normal DR-setting, and resulted in reduced low-contrast object detectability.

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Section: Discussionmentioning

confidence: 99%

Image quality assessment of a 1.5T dedicated magnetic resonance-simulator for radiotherapy with a flexible radio frequency coil setting using the standard American College of Radiology magnetic resonance imaging phantom test

Wong

Yuan

et al. 2017

Quant. Imaging Med. Surg.

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“…DXA, QCT, pQCT, HR-pQCT, MRI and QUS to ensure that accuracy and precision of the devices are consistent with manufacture guidelines (174,175). Accuracy is by definition the ability of a measurement to match the actual value of the quantity being measured and it is expressed in terms of accuracy error; precision, expressed in terms of PE, refers to the degree of reproducibility of repeated measurements under unchanged conditions (176).…”

Section: Quality Assurance (Qa) Proceduresmentioning

confidence: 99%

“…MRI is affected by multiple technical and image quality problems and, even if several organizations suggested their QA recommendations and each manufacturer usually uses its own test protocols, the development of universally accepted guidelines would be desirable in MRI (175,(189)(190)(191).…”

Section: Quality Assurance (Qa) Proceduresmentioning

confidence: 99%

“…The ACR method provides a comprehensive and easy to perform assessment of the performance of an MRI scanner and proved to be feasible in QA procedures (175,192). Its main advantages include the definition of a standardized image quality measurement protocol and the use of a standardized phantom developed specifically for the ACR to assess the technical quality of MRI sequences.…”

Section: Quality Assurance (Qa) Proceduresmentioning

confidence: 99%

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Quantitative imaging techniques for the assessment of osteoporosis and sarcopenia

Guerri

Mercatelli

Gómez

et al. 2018

Quant. Imaging Med. Surg.

117

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Bone and muscle are two deeply interconnected organs and a strong relationship between them exists in their development and maintenance. The peak of both bone and muscle mass is achieved in early adulthood, followed by a progressive decline after the age of 40. The increase in life expectancy in developed countries resulted in an increase of degenerative diseases affecting the musculoskeletal system. Osteoporosis and sarcopenia represent a major cause of morbidity and mortality in the elderly population and are associated with a significant increase in healthcare costs. Several imaging techniques are currently available for the non-invasive investigation of bone and muscle mass and quality. Conventional radiology, dual energy X-ray absorptiometry (DXA), computed tomography (CT), magnetic resonance imaging (MRI) and ultrasound often play a complementary role in the study of osteoporosis and sarcopenia, depicting different aspects of the same pathology. This paper presents the different imaging modalities currently used for the investigation of bone and muscle mass and quality in osteoporosis and sarcopenia with special emphasis on the clinical applications and limitations of each technique and with the intent to provide interesting insights into recent advances in the field of conventional imaging, novel high-resolution techniques and fracture risk.

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“…These parameters should now be evaluated in a multicenter prospective study with a unified imaging protocol. In such a prospective study, the comparability of the imaging results of MRI scanners from different manufacturers can also addressed, since the results may be quite different as shown in the past in other specialties such as oncology [29] . Other technologies to evaluate strictures are DWI (see above) and 'magnetization transfer' (MT)-MRI [30] .…”

Section: Evaluation Of Strictures In CDmentioning

confidence: 99%

Imaging in Inflammatory Bowel Diseases - Magnetic Resonance Imaging

Herfarth

Schreyer

2015

Dig Dis

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Diagnostic imaging techniques play an important role in the diagnosis and management of patients with inflammatory bowel diseases (IBDs). The approach should be guided by considerations of diagnostic accuracy, concerns about patient exposure to ionizing radiation, local expertise and tolerance of the endoscopic and/or imaging technique. In regard to the clinical diagnostic value (sensitivity, specificity and accuracy), no significant differences exist between CT and MRI for the evaluation of the extent of inflammation, stricturing, penetrating disease or extraluminal complications such as abscesses. Due to the absence of radiation exposure, MRI of the intestine is recommended as the first-line imaging modality in patients with suspected or established IBD. The focus of this review is the latest developments in MRI techniques to detect IBDs. Specifically, the use of new indices for the grading of inflammation or assessing bowel damage as well as innovative experimental approaches such as diffusion-weighted imaging or magnetization-transfer MRI to evaluate and quantify the degree of intestinal inflammation and fibrosis in stricturing Crohn's disease are discussed.

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MRI quality assurance using the ACR phantom in a multi-unit imaging center

Abstract: (2011) MRI quality assurance using the ACR phantom in a multi-unit imaging center, Acta Oncologica, 50:6, 966-972,

Cited by 66 publications

References 12 publications

Image quality assessment of a 1.5T dedicated magnetic resonance-simulator for radiotherapy with a flexible radio frequency coil setting using the standard American College of Radiology magnetic resonance imaging phantom test

Image quality assessment of a 1.5T dedicated magnetic resonance-simulator for radiotherapy with a flexible radio frequency coil setting using the standard American College of Radiology magnetic resonance imaging phantom test

Quantitative imaging techniques for the assessment of osteoporosis and sarcopenia

Imaging in Inflammatory Bowel Diseases - Magnetic Resonance Imaging

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