scholarly journals Four pulse sequences necessary for liver MRI interpretation

2020 ◽  
pp. 56-67
Author(s):  
Linda Brown
Keyword(s):  
Imaging Modality ◽  
Pulse Sequences ◽  
Liver Mri ◽  
Multiple Pulse

MRI is the best imaging modality for detection and characterization of liver masses. There are multiple pulse sequences used in MRI and they can be confusing and difficult to understand. Therefore, four important pulse sequences are introduced in this article in order to simplify the seemingly complex pulse sequences, and allow general radiologists and clinicians of all specialties to approach MRI of liver masses with ease.

scholarly journals Four pulse sequences necessary for liver MRI interpretation

2020 ◽  
Vol 21 (1) ◽  
pp. 57-67
Author(s):  
Linda Brown
Keyword(s):  
Imaging Modality ◽  
Pulse Sequences ◽  
Liver Mri ◽  
Multiple Pulse

MRI is the best imaging modality for detection and characterization of liver masses. There are multiple pulse sequences used in MRI and they can be confusing and difficult to understand. Therefore, four important pulse sequences are introduced in this article in order to simplify the seemingly complex pulse sequences, and allow general radiologists and clinicians of all specialties to approach MRI of liver masses with ease.

scholarly journals Canadian Society of Thoracic Radiology/Canadian Association of Radiologists Clinical Practice Guidance for Non-Vascular Thoracic MRI

2021 ◽  
pp. 084653712199896
Author(s):  
Elsie T. Nguyen ◽  
Hamid Bayanati ◽  
Ana-Maria Bilawich ◽  
Felipe Sanchez Tijmes ◽  
Robert Lim ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Imaging Modality ◽  
Pulse Sequences ◽  
Young Patients ◽  
Lung Parenchyma ◽  
Motion Artifacts ◽  
Proton Density ◽  
Canadian Society ◽  
Canadian Association

Historically thoracic MRI has been limited by the lower proton density of lung parenchyma, cardiac and respiratory motion artifacts and long acquisition times. Recent technological advancements in MR hardware systems and improvement in MR pulse sequences have helped overcome these limitations and expand clinical opportunities for non-vascular thoracic MRI. Non-vascular thoracic MRI has been established as a problem-solving imaging modality for characterization of thymic, mediastinal, pleural chest wall and superior sulcus tumors and for detection of endometriosis. It is increasingly recognized as a powerful imaging tool for detection and characterization of lung nodules and for assessment of lung cancer staging. The lack of ionizing radiation makes thoracic MRI an invaluable imaging modality for young patients, pregnancy and for frequent serial follow-up imaging. Lack of familiarity and exposure to non-vascular thoracic MRI and lack of consistency in existing MRI protocols have called for clinical practice guidance. The purpose of this guide, which was developed by the Canadian Society of Thoracic Radiology and endorsed by the Canadian Association of Radiologists, is to familiarize radiologists, other interested clinicians and MR technologists with common and less common clinical indications for non-vascular thoracic MRI, discuss the fundamental imaging findings and focus on basic and more advanced MRI sequences tailored to specific clinical questions.

scholarly journals Interobserver agreement of Prostate Imaging–Reporting and Data System (PI-RADS–v2)

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Hala Maher Ahmed ◽  
Ahmed Ebrahim Ebeed ◽  
Ahmed Hamdy ◽  
Mohamed Abou El-Ghar ◽  
Ahmed Abdel Khalek Abdel Razek
Keyword(s):  
Interobserver Agreement ◽  
Imaging Modality ◽  
Peripheral Zone ◽  
Transitional Zone ◽  
Data System ◽  
3 Tesla ◽  
Prostate Imaging ◽  
Percent Agreement ◽  
3 Tesla Mri

Abstract Background A retrospective study was conducted on 71 consecutive patients with suspected prostate cancer (PCa) with a mean age of 56 years and underwent mp-MRI of the prostate at 3 Tesla MRI. Two readers recognized all prostatic lesions, and each lesion had a score according to Prostate Imaging–Reporting and Data System version 2 (PI-RADS-v2). Purpose of the study To evaluate the interobserver agreement of PI-RADS-v2 in characterization of prostatic lesions using multiparametric MRI (mp-MRI) at 3 Tesla MRI. Results The overall interobserver agreement of PI-RADS-v2 for both zones was excellent (k = 0.81, percent agreement = 94.9%). In the peripheral zone (PZ) lesions are the interobserver agreement for PI-RADS II (k = 0.78, percent agreement = 83.9%), PI-RADS III (k = 0.66, percent agreement = 91.3 %), PI-RADS IV (k = 0.69, percent agreement = 93.5%), and PI-RADS V (k = 0.91, percent agreement = 95.7 %). In the transitional zone (TZ) lesions are the interobserver agreement for PI-RADS I (k = 0.98, percent of agreement = 96%), PI-RADS II (k = 0.65, percent agreement = 96%), PI-RADS III (k = 0.65, percent agreement = 88%), PI-RADS IV (k = 0.83, percent agreement = 96%), and PI-RADS V (k = 0.82, percent agreement = 92%). Conclusion We concluded that PI-RADS-v2 is a reliable and a reproducible imaging modality for the characterization of prostatic lesions and detection of PCa.

scholarly journals Encephalocele: know it to deal with it

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Nilkanth Laxman Pal ◽  
Ambika Sumeet Juwarkar ◽  
Sanjaya Viswamitra
Keyword(s):  
Prognostic Factors ◽  
Imaging Modality ◽  
Point Of View ◽  
Extensive Literature ◽  
Resonance Imaging ◽  
Imaging Protocol ◽  
Imaging Protocols ◽  
Associated Malformations ◽  
Associated Abnormalities

Abstract Background Encephaloceles refer to the herniation of intracranial contents through the defect in the dura and calvarium. This article aims to equip the radiologists with all the necessary information to approach a case of encephalocele in a systematic manner and report in an organized format. Thus reduce the reporting time without overlooking any detail. Main text An extensive literature review was performed searching through the standard textbooks and electronic databases to obtain thorough information on the various encephaloceles particularly from a radiological point of view. The author’s observations were also incorporated in the review. Among the available imaging modalities, magnetic resonance imaging is the most versatile and considered the imaging modality of choice because of superior anatomic resolution in the characterization of central nervous system malformation. This study provides the reporting radiologist with a methodical guide to approach a case of encephalocele discussing the imaging protocol, relevant anatomy, classification, associated abnormalities, and imaging prognostic factors. Conclusion Encephalocele has always been a subject of predicament for radiologists. Understanding the relevant terminologies, anatomy, imaging protocols, classification, associated malformations/anomalies, and imaging prognostic factors will help to methodically approach each case and provide a systematic and comprehensive report.

scholarly journals Elasto-mammography: Theory, Algorithm, and Phantom Study

2006 ◽  
Vol 2006 ◽  
pp. 1-11 ◽  
Author(s):  
Z. G. Wang ◽  
Y. Liu ◽  
L. Z. Sun ◽  
G. Wang ◽  
L. L. Fajardo
Keyword(s):  
Elastic Moduli ◽  
Imaging Modality ◽  
Contrast Ratio ◽  
Reconstruction Algorithm ◽  
Displacement Measurement ◽  
Breast Compression ◽  
Before And After ◽  
Breast Tissues ◽  
Displacement Information

A new imaging modality framework, called elasto-mammography, is proposed to generate the elastograms of breast tissues based on conventional X-ray mammography. The displacement information is extracted from mammography projections before and after breast compression. Incorporating the displacement measurement, an elastography reconstruction algorithm is specifically developed to estimate the elastic moduli of heterogeneous breast tissues. Case studies with numerical breast phantoms are conducted to demonstrate the capability of the proposed elasto-mammography. Effects of noise with measurement, geometric mismatch, and elastic contrast ratio are evaluated in the numerical simulations. It is shown that the proposed methodology is stable and robust for characterization of the elastic moduli of breast tissues from the projective displacement measurement.

scholarly journals CHARACTERIZATION OF PORTAL HYPERTENSION IN GEZIRASTATE (SUDAN) USING ULTRASOUND

2019 ◽  
Vol 7 (7) ◽  
pp. 30-38
Author(s):  
Abdal Gadir Yonis ◽  
Al Safi Ahmed Abdallash ◽  
Mona Ahmed ◽  
Ashraf Mustafa Mohammed Osman
Keyword(s):  
Portal Hypertension ◽  
Endemic Area ◽  
Imaging Modality ◽  
Frequency Range ◽  
Portal Fibrosis ◽  
Portable Ultrasound ◽  
Schistosomiasis Mansoni ◽  
High Incidence ◽  
A Prospective Study

Peri-sinusoidal portal hypertension with frequent episodes of upper gastro intestinal variceal bleeding are hallmarks of hepatic-splenic schistosomiasis (Mansoni or Japonicum). This a prospective study compromise of 306 consecutive patients at North Gezira State between 2016 to 2019, aimed to characterize the portal hypertension &to minimize potentiallysevere and deadly complications. Using  B-mode grayscale ultrasound, The images done by portable Sono- Scape- A6 machine using convex probe with frequency range from 3.5 to 5 MHz and the data analyzed by SPSS version 15.The result showed that the majority of patients were male and portal hypertension had high incidence associated with peri portal fibrosis(schistosomiasis), the result also showed that : out of 360 patients under study, there were 209(58.1%) had portal hypertension, 106(29.4%) had PPF, and 45(12.5%) were normal patients.  The study concluded that the portable ultrasound machine is the most frequently used imaging modality to assess patients for the presence of portal hypertension especially in the endemic area.

Comparative Assessment of Widefield Fundus Autofluorescence Patterns in Retinoschisis and Retinal Detachment

2020 ◽  
Vol 4 (4) ◽  
pp. 286-292
Author(s):  
Jessica L. Cao ◽  
Thais F. Conti ◽  
Grant L. Hom ◽  
Amy S. Babiuch ◽  
Tyler Greenlee ◽  
...  
Keyword(s):  
Retinal Detachment ◽  
Imaging Modality ◽  
Fundus Autofluorescence ◽  
Case Series ◽  
Comparative Assessment ◽  
High Variability ◽  
Retrospective Case ◽  
Data Points ◽  
Sd Oct

Purpose: This article characterizes widefield fundus autofluorescence (WF-FAF) patterns in retinoschisis (RS), retinal detachment (RD), and combined retinoschisis-detachment (RS/RD), and to correlate them with spectral-domain optical coherence tomography (SD-OCT) findings. Methods: A retrospective case series of 13 eyes with senile RS, RD, or RS/RD is presented. One eye underwent imaging of 2 areas within the retina, resulting in 14 data points. Independent, masked graders classified pathology on SD-OCT as RS, RD, or RS/RD and graded WF-FAF images for either hypoautofluorescent areas or mixed autofluorescence (AF) (hyper-AF, iso-AF, hyper-AF with hypo-AF, hyper-AF with iso-AF, or hypo-AF with iso-AF). Results: There was no statistically significant correlation between the autofluorescence pattern and the type of retinal abnormality ( P = .74). Conclusions: High variability was found in the characterization of WF-FAF in patients with RS and RD. SD-OCT remains the criterion-standard imaging modality in distinguishing RS from RD in clinically ambiguous cases.

Differential Diagnosis of Colonic Strictures: Pictorial Review with Illustrations from Computed Tomography Colonography

2015 ◽  
Vol 66 (3) ◽  
pp. 259-271 ◽  
Author(s):  
Daniel Wan ◽  
Silvio G. Bruni ◽  
John A. Dufton ◽  
Paul O'Brien
Keyword(s):  
Computed Tomography ◽  
Gold Standard ◽  
Ct Colonography ◽  
Imaging Modality ◽  
Mount Sinai Hospital ◽  
Imaging Features ◽  
University Of Toronto ◽  
Pictorial Review ◽  
Ct Features

Strictures of the colon can lead to significant morbidity requiring surgical management. The etiology of strictures is broad and generally categorized as benign, malignant, or pseudostrictures. Computed tomography (CT) is a crucial imaging modality in the assessment and characterization of colonic pathologies but colonoscopy remains the diagnostic gold standard. However, in the setting of incomplete colonoscopy due to strictures, the imaging features of CT will be relied on. This review will focus on the CT features of different colon pathologies leading to strictures and will be illustrated with images from 10 years of experience with CT colonography at our institutions from 2002-2012 (Hotel Dieu Hospital, Queen's University and Mount Sinai Hospital, University of Toronto).

Sign in / Sign up

Export Citation Format

Share Document