scholarly journals The Capabilities and Limitations of Clinical Magnetic Resonance Imaging for Detecting Kidney Stones: A Retrospective Study

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
El-Sayed H. Ibrahim ◽  
Joseph G. Cernigliaro ◽  
Mellena D. Bridges ◽  
Robert A. Pooley ◽  
William E. Haley
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Kidney Stones ◽  
Kidney Stone ◽  
Resonance Imaging ◽  
Case Scenario ◽  
Stone Size ◽  
Clinical Magnetic Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Ct And Mri

The purpose of this work was to investigate the performance of currently available magnetic resonance imaging (MRI) for detecting kidney stones, compared to computed tomography (CT) results, and to determine the characteristics of successfully detected stones. Patients who had undergone both abdominal/pelvic CT and MRI exams within 30 days were studied. The images were reviewed by two expert radiologists blinded to the patients’ respective radiological diagnoses. The study consisted of four steps: (1) reviewing the MRI images and determining whether any kidney stone(s) are identified; (2) reviewing the corresponding CT images and confirming whether kidney stones are identified; (3) reviewing the MRI images a second time, armed with the information from the corresponding CT, noting whether any kidney stones are positively identified that were previously missed; (4) for all stones MRI-confirmed on previous steps, the radiologist experts being asked to answer whether in retrospect, with knowledge of size and location on corresponding CT, these stones would be affirmed as confidently identified on MRI or not. In this best-case scenario involving knowledge of stones and their locations on concurrent CT, radiologist experts detected 19% of kidney stones on MRI, with stone size being a major factor for stone identification.

scholarly journals Anatomy and Pathology of the Texel Sheep Larynx

2019 ◽  
Vol 6 (1) ◽  
pp. 21 ◽  
Author(s):  
Katie Waine ◽  
Ben Strugnell ◽  
John Remnant ◽  
Fiona Lovatt ◽  
Martin Green ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Upper Respiratory Tract ◽  
Resonance Imaging ◽  
Laryngeal Disease ◽  
Upper Respiratory ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Measurements ◽  
Ct And Mri

Laryngeal chondritis, or “Texel throat”, is a disease affecting the upper respiratory tract of sheep with breeds like the Texel appearing to be predisposed. Previous work suggests the conformation of these breeds of sheep may be predisposing these animals to laryngeal disease. This study evaluated the anatomy of the Texel sheep larynx and describes incidental pathology. Forty-three larynges from rams of the Texel and Bluefaced Leicester breeds of sheep were measured and photographed. A larynx from each breed was submitted for computed tomography (CT) and magnetic resonance imaging (MRI). Measurements, photography, CT, and MRI demonstrated a difference in the anatomy of the larynx between breeds and a higher proportion of Texel sheep had laryngeal lesions. This study supports the hypothesis that the anatomy of the Texel sheep could be pre-disposing the breed to laryngeal chondritis.

Magnetic Resonance Imaging in Acoustic Neuroma Diagnosis

1986 ◽  
Vol 95 (1) ◽  
pp. 16-20 ◽  
Author(s):  
John W. House ◽  
Victor Waluch ◽  
Robert K. Jackler
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cerebellopontine Angle ◽  
Internal Auditory Canal ◽  
Resonance Imaging ◽  
Invasive Procedures ◽  
Acoustic Neuromas ◽  
Magnetic Resonance Imaging Mri ◽  
Contrast Ct ◽  
Ct And Mri

Magnetic resonance imaging (MRI) is capable of providing excellent images of the contents of the internal auditory canal and cerebellopontine angle. In order to determine whether MRI is comparable to air contrast computed tomography in the diagnosis of small acoustic neuromas, 44 patients with suspected retrocochlear disease were studied with both CT and MRI. Twenty-one lesions were identified successfully with MRI and CT. The size of the tumors ranged from 4 mm to 5 cm. In twenty-three nontumor patients the normal audiovestibular nerve bundles were well visualized. Air contrast CT, on the other hand, was falsely positive in two cases. The results of this study indicate that MRI is suitable as the primary anatomic investigation in patients suspected of having retrocochlear lesions. It has the advantages of being highly reliable as well as free of ionizing radiation and the need for invasive procedures. The expense of MRI compares favorably with that of combined intravenous and gas contrast CT.

scholarly journals CT and MRI findings of bronchopulmonary endometriosis: a case presentation

2018 ◽  
Vol 7 (10) ◽  
pp. 205846011880116 ◽  
Author(s):  
Tomohide Sanada ◽  
Jinho Park ◽  
Masaru Hagiwara ◽  
Norihiko Ikeda ◽  
Takeshi Nagai ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Left Lung ◽  
Lung Nodules ◽  
Resonance Imaging ◽  
Mri Findings ◽  
Case Presentation ◽  
Magnetic Resonance Imaging Mri ◽  
Ct And Mri

Intrathoracic endometriosis is classified into pleurodiaphragmatic endometriosis and bronchopulmonary endometriosis. Bronchopulmonary endometriosis is rare. Computed tomography (CT) findings of bronchopulmonary endometriosis are lung nodules, with or without cavities, or surrounding ground-glass opacities. Features vary with menstrual status. Recently, the usefulness of magnetic resonance imaging (MRI) was reported for diagnosis of intrathoracic endometriosis, but most published reports were about pleurodiaphragmatic endometriosis. We present CT and MRI findings of bronchopulmonary endometriosis in the left lung that showed a gradually enlarging nodule with enhancing area.

ACR Select Identifies Inappropriate Underutilization of Magnetic Resonance Imaging in British Columbia

2015 ◽  
Vol 66 (3) ◽  
pp. 208-211 ◽  
Author(s):  
Kathleen Eddy ◽  
Adam Beaton ◽  
Richard Eddy ◽  
John Mathieson
Keyword(s):  
Magnetic Resonance Imaging ◽  
British Columbia ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Appropriateness Criteria ◽  
Acr Appropriateness Criteria ◽  
Software Program ◽  
Magnetic Resonance Imaging Mri ◽  
Manual Review ◽  
Ct And Mri

Purpose A study was performed to evaluate the ACR Select software in determining the level of appropriateness of computed tomography (CT) and magnetic resonance imaging (MRI) in Island Health in British Columbia. Methods A total of 1228 consecutive CT and MRI studies performed in a 3-day period were entered into a software program provided by the National Decision Support Company based on the ACR Appropriateness Criteria. The program was able to analyze 93% (1141) of these studies. A subset of these requisitions was manually reviewed. Results The software program demonstrated a very low 2.5% inappropriate rate and manual review showed an even lower number of 0.6%. In a sample of studies deemed to be appropriate by the software, manual review agreed with this ranking in all cases. In addition, in 20% of cases where CT was done, the software program suggested that MRI would be a more appropriate choice. Conclusions First, the ACR Select software is a useful tool to assess appropriateness of CT and MRI, although it may underestimate the level of appropriateness of studies labeled as inappropriate. Second, CT and MRI are being ordered appropriately in Island Health in British Columbia. The software recommendation of MRI as more appropriate in 20% of cases where CT was done suggests a lack of MRI resources in Island Health.

Methodologic Considerations in Planning Clinical Trials of Cost-Effectiveness of Magnetic Resonance Imaging With a Commentary on Guyatt and Drummond

1985 ◽  
Vol 1 (3) ◽  
pp. 567-581 ◽  
Author(s):  
Milton C. Weinstein
Keyword(s):  
Magnetic Resonance Imaging ◽  
Clinical Trials ◽  
Cost Effectiveness ◽  
Magnetic Resonance ◽  
Critical Discussion ◽  
Resonance Imaging ◽  
Clinical Magnetic Resonance Imaging ◽  
Or Methodology ◽  
Magnetic Resonance Imaging Mri ◽  
The Cost

The purpose of this paper is to outline some of the key methodologic issues in designing clinical trials to assess the cost-effectiveness of clinical magnetic resonance imaging (MRI). Because the possible objectives of such trials are so diverse, and the appropriate methodologies correspondingly numerous, no attempt is made to identify a single objective or methodology as appropriate. Rather, this paper should be read as an “options paper,” in which alternative formulations of objectives, outcome measures, study design, and protocol instrumentation are reviewed, with critical discussion of their theoretical strengths and weaknesses, as well as their practical implementability.

Anaesthesia for radiology

2018 ◽  
Author(s):  
Philippa Dix
Keyword(s):  
Magnetic Resonance Imaging ◽  
Interventional Radiology ◽  
Radiofrequency Ablation ◽  
Magnetic Resonance ◽  
Anaesthetic Techniques ◽  
Anaesthetic Management ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Interventional Radiology Procedures ◽  
Ct And Mri

This chapter discusses the anaesthetic management of patients for computerized tomography (CT) or magnetic resonance imaging (MRI) scanning or interventional radiology procedures. It describes the particular hazards associated with the CT and MRI scanning rooms and recommends appropriate anaesthetic techniques. Interventional radiology procedures include angioplasty, stenting, embolization, chemotherapy, radiofrequency ablation, cryoablation, thrombolysis, and vertebroplasty or cementoplasty.

Grafting of Gd-DTPA onto MOF-808 with enhancing MRI performance for guiding photothermal therapy

2021 ◽  
Author(s):  
Mingjie Jia ◽  
Xinyu Yang ◽  
Yanan Chen ◽  
Meie He ◽  
Weixiu Zhou ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Agents ◽  
Photothermal Therapy ◽  
Resonance Imaging ◽  
Clinical Magnetic Resonance Imaging ◽  
Longitudinal Relaxivity ◽  
Magnetic Resonance Imaging Mri

Gd(III) chelates are important T1-weighted contrast agents used in clinical magnetic resonance imaging (MRI), but their low longitudinal relaxivity (r1) results in limited imaging efficiency. In this work, we utilize...

scholarly journals Evaluating the Efficiency of Work of the Department of Computed Tomography and Magnetic Resonance Imaging

2019 ◽  
Vol 100 (5) ◽  
pp. 278-285
Author(s):  
K. K. Osadchiy ◽  
E. A. Mershina ◽  
A. E. Bragina ◽  
V. E. Sinitsyn
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Lean Manufacturing ◽  
Image Interpretation ◽  
Resonance Imaging ◽  
Work Processes ◽  
Magnetic Resonance Imaging Mri ◽  
Ct And Mri

Objectives. (1) To evaluate the efficiency of work of the Department of Computed Tomography (CT) and Magnetic Resonance Imaging (MRI); (2) to study of its work processes; and (3) to elaborate recommendations for their optimization.Material and methods. Using the principles of lean manufacturing and the original methodology of the Philips Co., the investigators made a comprehensive assessment of the work of the Tomography Department, Center for Radiation Diagnosis, Treatment and Rehabilitation, Ministry of Health of the Russian Federation, in December 2016 to February 2017, including: (1) a study of management reports; (2) oral interviews of employees; (3) a survey of employees, by using a specially designed questionnaire; (4) direct observation and subsequent description of work processes; and (5) assessment of patient satisfaction, by calculating the net promoter score. Based on the findings, the investigators calculated the throughput potential of CT and MRI, described the factors influencing the possibility of realizing this potential, developed recommendations to enhance the efficiency of work processes, and ranked the latter by the magnitude of the expected effect, by the complexity of implementation, and by material costs, followed by prioritization.Results. Assessment of the throughput potential has shown that CT and MRI examinations can be performed by 50.6% and 23.2% more, respectively. This can be achieved by additionally attracting patients, reducing equipment downtime, optimizing work processes, most of all at the stage of patient recording and registration, as well as at the stage of image interpretation and creation of a conclusion. The developed recommendations for optimizing work processes included measures of varying effectiveness and complexity, which could rank them according to three priority levels and identify long-term strategic initiatives.Conclusion. The comprehensive study of the efficiency of work of the Departments of CT and MRI made it possible to quantify the potential for increasing the throughput of CT and MRI, to consider in detail the stages of a medical service delivery process, to reveal areas for improving the process, and to form a set of recommendations for their optimization.

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