Magnetic resonance imaging of salivary glands

Salivary glands tumors account for 2-5% of tumors in the head and neck region, possibly being benign or malignant. Magnetic resonance imaging (MRI) presents high soft tissue contrast resolution, thus being an excellent method for salivary gland analysis. The objective of this literature review is to analyze MRI as an evaluation instrument for the diagnosis of salivary glands lesions. Compared to other imaging techniques, MRI can better evaluate the relationship between adjacent anatomical structures, presenting greater sensitivity and specificity.

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Perfusion Magnetic Resonance Imaging to Assess Brain Tumor Responses to New Therapies

Cancer Control ◽

10.1177/107327489800500202 ◽

1998 ◽

Vol 5 (2) ◽

pp. 115-123 ◽

Cited By ~ 16

Author(s):

Michael H. Lev ◽

Fred Hochberg

Keyword(s):

Magnetic Resonance Imaging ◽

Brain Tumor ◽

Magnetic Resonance ◽

Imaging Techniques ◽

Perfusion Mri ◽

Perfusion Magnetic Resonance Imaging ◽

Normal Brain ◽

Resonance Imaging ◽

New Therapies ◽

Magnetic Resonance Imaging Mri

Background: Although magnetic resonance imaging (MRI) is effective in detecting the location of intracranial tumors, new imaging techniques have been studied that may enhance the specificity for the prediction of histologic grade of tumor and for the distinction between recurrence and tumor necrosis associated with cancer therapy. Methods: The authors review their experience and that of others on the use of perfusion magnetic resonance imaging to evaluate responses of brain tumors to new therapies. Results: Functional imaging techniques that can distinguish tumor from normal brain tissue using physiological parameters. These new approaches provide maps of tumor perfusion to monitor the effects of novel compounds that restrict tumor angiogenesis. Conclusions: Perfusion MRI not only may be as effective as radionuclide-based techniques in sensitivity and specificity in assessing brain tumor responses to new therapies, but also may offer higher resolution and convenient co-registration with conventional MRI, as well as time- and cost-effectiveness. Further study is needed to determine the role of perfusion MRI in assessing brain tumor responses to new therapies.

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Reasons for discordances between ultrasonography and magnetic resonance imaging in the evaluation of the ankle, hindfoot and heel of the patients with rheumatoid arthritis

Medical Ultrasonography ◽

10.11152/mu-2304 ◽

2019 ◽

Vol 21 (4) ◽

pp. 405 ◽

Cited By ~ 2

Author(s):

Oana Șerban ◽

Daniela Fodor ◽

Iulia Papp ◽

Mihaela Cosmina Micu ◽

Dan Gabriel Duma ◽

...

Keyword(s):

Rheumatoid Arthritis ◽

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Disease Activity ◽

Activity Index ◽

Imaging Techniques ◽

Disease Activity Index ◽

Resonance Imaging ◽

Magnetic Resonance Imaging Mri ◽

Definition Of

Aim: To compare the ultrasonography (US) performance with magnetic resonance imaging (MRI) in identifying pathology in ankles, hindfeet and heels of rheumatoid arthritis (RA) patients and to evaluate the reasons for discordances between the two imaging methods.Material and methods: RA patients were enrolled and evaluated using the Clinical Disease Activity Index (CDAI) and the Disease Activity Score 28 with C-reactive Protein (DAS28-CRP). The ankle (tibiotalar joint, tendons), hindfoot (talonavicular, subtalar joints) and heel of the most symptomatic or dominant foot (for the asymptomatic patient)were evaluated by two pairs of examiners using US and contrast-enhanced MRI.Results: Totally, 105 joints, 245 tendons and 35 heels in 35 patients [mean age 59.2±11.25 years old, median disease duration 36 (16.5-114), mean CDAI 19.87±12.7] were evaluated. The interobserver agreements between the two sonographers, and the two radiologists were good and very good (k=0.624-0.940). The overall agreement between US and MRI was very good for subcalcaneal panniculitis (k=0.928, p<0.001), moderate for synovitis (k=0.463, p<0.001) and tenosynovitis (k=0.514, p<0.001), fair for osteophytes (k=0.260, p=0.004), and poor for erosions (k=0.063, p=0.308) and heel’s structures. MRI found more erosions, synovitis, osteophytes,tenosynovitis and retrocalcaneal bursitis, but US found more enthesophytes and plantar fasciitis. Many of the discordancesbetween the two imaging techniques have explanations related to the technique itself or definition of the pathologic findings.Conclusions: US is comparable to MRI for the evaluation of ankle, hindfoot and heel in RA patients and discordances in theinterpretation of the pathological findings/normal structures must be carefully analyzed.

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Magnetic Resonance Imaging of Rectal Cancer

Journal of Gastrointestinal and Abdominal Radiology ◽

10.1055/s-0039-1683772 ◽

2019 ◽

Vol 02 (01) ◽

pp. 018-032

Author(s):

Ekta Maheshwari ◽

Gitanjali Bajaj ◽

Kedar Jambhekar ◽

Tarun Pandey ◽

Roopa Ram

Keyword(s):

Magnetic Resonance Imaging ◽

Rectal Cancer ◽

Magnetic Resonance ◽

High Resolution ◽

Imaging Techniques ◽

Postoperative Recurrence ◽

Response To Therapy ◽

Resonance Imaging ◽

Primary Rectal Cancer ◽

Magnetic Resonance Imaging Mri

AbstractHigh-resolution magnetic resonance imaging (MRI) plays a pivotal role in the pretreatment assessment of primary rectal cancer. The success of this technique depends on obtaining good-quality high-resolution T2-weighted images of the primary tumor, orthogonal to rectal lumen. The goal of magnetic resonance staging is to identify patients who will benefit from neoadjuvant therapy prior to surgery to minimize postoperative recurrence and planning of optimal surgical approach. MRI also facilitates optimal identification of important prognostic factors, which improves both treatment selection and posttreatment follow-up. The objective of this article is to review the existing literature and provide a concise update on various aspects of rectal cancer imaging, discuss the current role of advanced imaging techniques such as diffusion-weighted and perfusion imaging in the evaluation of rectal cancer, and to assess response to therapy.

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Magnetic resonance imaging in gynecological practice

Kazan medical journal ◽

10.17816/kazmj83653 ◽

1997 ◽

Vol 78 (6) ◽

pp. 439-441

Author(s):

A. T. Valiullina ◽

L. M. Tukhvatullina ◽

R. F. Bakhtiozin ◽

I. R. Chuvashaev

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Soft Tissues ◽

Dynamic Control ◽

Anatomical Structure ◽

Resonance Imaging ◽

Noninvasive Diagnostics ◽

Tissue Contrast ◽

Magnetic Resonance Imaging Mri ◽

Natural Tissue

Magnetic resonance imaging (MRI) has become one of the leading methods of noninvasive diagnostics in the last 10 years. Interest in this type of examination is due to its great potential possibilities: absence of radiation exposure, high natural tissue contrast, obtaining sections of any orientation, possibility of multiple examination and dynamic control, determining not only the anatomical structure of soft tissues, but also their chemical composition.

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Ruptured aneurysm of noncoronary sinus of valsalva: demonstration with magnetic resonance imaging

Acta Radiologica ◽

10.1080/02841850802258829 ◽

2008 ◽

Vol 49 (8) ◽

pp. 889-892 ◽

Cited By ~ 3

Author(s):

T. C. Dincer ◽

I. Basarici ◽

C. Calisir ◽

A. Mete ◽

C. Ermis ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Imaging Techniques ◽

Sinus Of Valsalva ◽

Resonance Imaging ◽

Conventional Angiography ◽

Rare Lesion ◽

Magnetic Resonance Imaging Mri ◽

The Right ◽

Diagnostic Importance

There are few published reports regarding imaging findings of sinus of Valsalva aneurysms (SVA) with magnetic resonance imaging (MRI). We present an unusual form of ruptured SVA, emphasizing the diagnostic importance of MRI among a range of imaging techniques. This case report describes a case of idiopathic (thought to be congenital in origin), acutely symptomatic ruptured noncoronary SVA diagnosed by MRI and confirmed with conventional angiography and surgery. MRI accurately showed aneurysm size, location, and rupture into the right atrium and provided valuable information about this rare lesion.

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Nanoparticle-Based Paramagnetic Contrast Agents for Magnetic Resonance Imaging

Contrast Media & Molecular Imaging ◽

10.1155/2019/1845637 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 24

Author(s):

Juan Pellico ◽

Connor M. Ellis ◽

Jason J. Davis

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Contrast Agents ◽

Imaging Modality ◽

Relaxation Times ◽

Deep Penetration ◽

Resonance Imaging ◽

Tissue Contrast ◽

Recent Developments ◽

Magnetic Resonance Imaging Mri

Magnetic resonance imaging (MRI) is a noninvasive medical imaging modality that is routinely used in clinics, providing anatomical information with micron resolution, soft tissue contrast, and deep penetration. Exogenous contrast agents increase image contrast by shortening longitudinal (T1) and transversal (T2) relaxation times. Most of the T1 agents used in clinical MRI are based on paramagnetic lanthanide complexes (largely Gd-based). In moving to translatable formats of reduced toxicity, greater chemical stability, longer circulation times, higher contrast, more controlled functionalisation and additional imaging modalities, considerable effort has been applied to the development of nanoparticles bearing paramagnetic ions. This review summarises the most relevant examples in the synthesis and biomedical applications of paramagnetic nanoparticles as contrast agents for MRI and multimodal imaging. It includes the most recent developments in the field of production of agents with high relaxivities, which are key for effective contrast enhancement, exemplified through clinically relevant examples.

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Magnetic resonance imaging of the gallbladder: spectrum of abnormalities

Acta Radiologica ◽

10.1080/02841850701324102 ◽

2007 ◽

Vol 48 (5) ◽

pp. 476-482 ◽

Cited By ~ 25

Author(s):

K. M. Elsayes ◽

E. P. Oliveira ◽

V. R. Narra ◽

F. M. EL-Merhi ◽

J. J. Brown

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Clinical Symptoms ◽

Malignant Tumors ◽

Gallbladder Wall ◽

Diagnostic Study ◽

Resonance Imaging ◽

Mr Cholangiopancreatography ◽

Tissue Contrast ◽

Magnetic Resonance Imaging Mri

Various pathologies involving the gallbladder can manifest clinically, producing nonspecific clinical symptoms and making diagnosis difficult and challenging. Real-time sonography is the most widely used diagnostic study for the gallbladder and the primary screening examination of choice. With increasing use of magnetic resonance imaging (MRI) and MR cholangiopancreatography (MRCP), gallbladder pathology is frequently seen. Understanding the basic patterns of various disease manifestations and appearance on MRI is the key to making an accurate diagnosis. Given its inherent tissue contrast and contrast sensitivity, MRI in conjunction with MRCP can be a very valuable test in evaluating gallbladder pathology. Gallbladder pathology can be classified into congenital (such as absence), inflammatory (acute, hemorrhagic, and chronic cholecystitis), traumatic, benign (polyps) and malignant tumors (gallbladder carcinoma and lymphoma), and other disease processes can be seen in cholelithiasis, cholesterosis, thickened gallbladder wall, and Mirrizzi syndrome.

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What are the current and future requirements for magnetic resonance imaging interpretation skills in radiotherapy? A critical review

Journal of Radiotherapy in Practice ◽

10.1017/s1460396916000418 ◽

2016 ◽

Vol 16 (1) ◽

pp. 79-84 ◽

Cited By ~ 2

Author(s):

Aston M. Midon ◽

Pete Bridge ◽

Mark Warren

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Critical Review ◽

Resonance Imaging ◽

Head And Neck Tumours ◽

Image Guided Radiotherapy ◽

Tissue Contrast ◽

Magnetic Resonance Imaging Mri ◽

Published Research

AbstractPurposeIncreasing usage of magnetic resonance imaging (MRI) in radiotherapy (RT) and the advent of MRI-based image-guided radiotherapy (IGRT) suggests a need for additional training within the RT profession. This critical review aimed to identify potential gaps in knowledge by evaluating the current skill base in MRI among therapeutic radiographers as evidenced by published research.MethodsPapers related to MRI usage were retrieved. Topic areas included outlining, planning and IGRT; diagnosis, follow-up and staging-related papers were excluded. After selection and further text analysis, papers were grouped by tumour site and year of publication.ResultsThe literature search and filtering resulted in a total of 123 papers, of which 66 were related to ‘outlining’, 37 to ‘planning’ and 20 to ‘IGRT’. The main sites of existing MRI expertise in RT were brain, central nervous system, prostate, and head and neck tumours. Expertise was clearly related to regions where MRI offered improved soft-tissue contrast. MRI studies within RT have been published from 2007 onwards at a steadily increasing rate.ConclusionCurrent use of MRI in RT is mainly restricted to sites where MRI offers a considerable imaging advantage over computed tomography. Given the changing use of MRI for image guidance, emerging therapeutic radiographers will require training in MRI interpretation across a wider range of anatomical regions.

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Importance and Qualitative Requirements of Magnetic Resonance Imaging for Therapy Planning in Rectal Cancer – Interdisciplinary Recommendations of AIO, ARO, ACO and the German Radiological Society

RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren ◽

10.1055/a-1299-1807 ◽

2020 ◽

Author(s):

Ulrike Irmgard Attenberger ◽

Stephan Clasen ◽

Michael Ghadimi ◽

Ulrich Grosse ◽

Gerald Antoch ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Evaluation Method ◽

Resonance Imaging ◽

Radiological Society ◽

Key Points ◽

Contrast Magnetic Resonance ◽

Tissue Contrast ◽

Magnetic Resonance Imaging Mri ◽

Therapeutic Decision Making

Due to its excellent intrinsic soft tissue contrast, magnetic resonance imaging allows excellent visualization and anatomical separation of therapy-relevant risk structures such as the mesorectal fascia, local lymph nodes, and vascular structures in patients with rectal carcinoma. This makes magnetic resonance imaging (MRI) a valuable evaluation method for further therapeutic stratification. In particular, MRI is indispensable for the decision to refrain from neoadjuvant therapy and to choose a primary surgical approach. In addition to the oncologically generally relevant T-, N-, and M-criteria, two further parameters are included: the extramural vascular infiltration and the circumferential resection margin. Due to the significant impact of MRI on further therapeutic decision-making, standardized MR image quality is considered essential. Key Points: Citation Format

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