A gemistocytic astrocytoma demonstrated high intensity on MR images

1990 ◽  
Vol 32 (2) ◽  
pp. 166-167 ◽  
Author(s):  
K. Abe ◽  
H. Hasegawa ◽  
Y. Kobayashi ◽  
H. Fujimura ◽  
S. Yorifuji ◽  
...  
Keyword(s):  
High Intensity ◽  
Mr Images ◽  
Gemistocytic Astrocytoma

scholarly journals A Case of Ovarian Pregnancy Diagnosed by MRI

2015 ◽  
Vol 2015 ◽  
pp. 1-3 ◽  
Author(s):  
Shingo Io ◽  
Masaaki Hasegawa ◽  
Takashi Koyama
Keyword(s):  
Ectopic Pregnancy ◽  
High Intensity ◽  
Transvaginal Ultrasonography ◽  
Mr Images ◽  
Diagnostic Challenge ◽  
Rare Form ◽  
Low Intensity ◽  
Ovarian Pregnancy ◽  
Gestational Sac ◽  
The Right

Ovarian pregnancy is a rare form of ectopic pregnancy, causing a great diagnostic challenge. We report a case of ovarian pregnancy in a 42-year-old woman, in whom MRI successfully demonstrated the implantation in the ovary. Transvaginal ultrasonography showed an echogenic mass in the right ovary but failed to demonstrate tubal pregnancy. T2-weighted MR images disclosed a gestational sac structure in the right ovary, which exhibited heterogeneous high intensity intermingled with punctate foci of distinct low intensity. MRI may be a useful tool for diagnosing ovarian pregnancy, by demonstrating a gestational sac in the ovary.

scholarly journals Segmentation Method for Magnetic Resonance-Guided High-Intensity Focused Ultrasound Therapy Planning

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
A. Vargas-Olivares ◽  
O. Navarro-Hinojosa ◽  
M. Maqueo-Vicencio ◽  
L. Curiel ◽  
M. Alencastre-Miranda ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Segmentation Algorithm ◽  
Focal Region ◽  
Therapy Planning ◽  
Mr Images ◽  
Monitoring Method ◽  
Data Set

High-intensity focused ultrasound (HIFU) is a minimally invasive therapy modality in which ultrasound beams are concentrated at a focal region, producing a rise of temperature and selective ablation within the focal volume and leaving surrounding tissues intact. HIFU has been proposed for the safe ablation of both malignant and benign tissues and as an agent for drug delivery. Magnetic resonance imaging (MRI) has been proposed as guidance and monitoring method for the therapy. The identification of regions of interest is a crucial procedure in HIFU therapy planning. This procedure is performed in the MR images. The purpose of the present research work is to implement a time-efficient and functional segmentation scheme, based on the watershed segmentation algorithm, for the MR images used for the HIFU therapy planning. The achievement of a segmentation process with functional results is feasible, but preliminary image processing steps are required in order to define the markers for the segmentation algorithm. Moreover, the segmentation scheme is applied in parallel to an MR image data set through the use of a thread pool, achieving a near real-time execution and making a contribution to solve the time-consuming problem of the HIFU therapy planning.

High-intensity lesion on T1-weighted MR images in neurofibromatosis type 1: a case of premalignant lesion

1997 ◽  
Vol 139 (11) ◽  
pp. 1085-1087 ◽  
Author(s):  
Y. Miaux ◽  
A. Guermazi ◽  
P. Cornu ◽  
K. Mokhtari ◽  
B. Singer ◽  
...  
Keyword(s):  
Neurofibromatosis Type 1 ◽  
High Intensity ◽  
Neurofibromatosis Type ◽  
Premalignant Lesion ◽  
Mr Images ◽  
Intensity Lesion

Segmental high intensity on T1-weighted hepatic MR images

2004 ◽  
Vol 30 (1) ◽  
pp. 60-64 ◽  
Author(s):  
M. Hashimoto ◽  
Y. Akabane ◽  
J. Heianna ◽  
T. Iwama ◽  
E. Tate ◽  
...  
Keyword(s):  
High Intensity ◽  
Mr Images

Periportal High Intensity on T2-Weighted MR Images in Acute Viral Hepatitis

1992 ◽  
Vol 16 (4) ◽  
pp. 564-567 ◽  
Author(s):  
Hisao Itoh ◽  
Toyohiko Sakai ◽  
Norio Takahashi ◽  
Masahisa Kitada ◽  
Masayuki Saito ◽  
...  
Keyword(s):  
Viral Hepatitis ◽  
High Intensity ◽  
Acute Viral Hepatitis ◽  
Mr Images

scholarly journals High-intensity basal ganglia lesions on T1-weighted MR images in neurofibromatosis.

1990 ◽  
Vol 154 (2) ◽  
pp. 369-373 ◽  
Author(s):  
S A Mirowitz ◽  
K Sartor ◽  
M Gado
Keyword(s):  
Basal Ganglia ◽  
High Intensity ◽  
Mr Images

Anterior High-Intensity Zone in Lumbar Discs: Prevalence and Association with Low Back Pain

Pain Medicine ◽  
2020 ◽  
Vol 21 (10) ◽  
pp. 2111-2116
Author(s):  
Zi-Xuan Wang ◽  
Zeng-Tao Hou ◽  
You-Gu Hu
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
High Intensity ◽  
Annulus Fibrosus ◽  
Low Back ◽  
Mr Images ◽  
Mr Image ◽  
High Intensity Zone ◽  
Age Related ◽  
Common Shape

Abstract Objectives To explore the features of high-intensity zone (HIZ) in anterior annulus fibrosus and assess the association of anterior HIZ with low back pain (LBP). Design, Setting, and Subjects A retrospective study of 5,940 discs in 1,188 individuals was conducted. Methods Subjects’ information and LBP symptoms confirmed by an orthopedic surgeon were acquired from the medical record. Magnetic resonance (MR) image reading and analysis were performed by two experienced blinded radiologists. Results Two hundred eighty individuals exhibited 355 anterior HIZs in 355 discs. The prevalence was 23.57%; 88.45% were located in the inferior part of the annulus fibrosus. It frequently occurred in the middle and upper segments of lumbar spine, especially at L3/4 (45.63%). Of the 355 anterior HIZs, only 79 (22.25%) were consecutive-slides HIZ. Round type (63.38%) was the most common shape of anterior HIZs. The highest prevalence was found in individuals aged 60–69 years. LBP was confirmed in 141 anterior-HIZ individuals. The incidence of LBP in anterior-HIZ individuals was significantly higher than in non-HIZ subjects (50.36% vs 35.24%, χ2 = 18.314, P < 0.001). Conclusions Anterior HIZ is a lower-prevalence, age-related sign on lumbar MR images. The spatial distribution of anterior HIZ can be distinguished from posterior HIZ. The number of consecutive anterior HIZ slides might suggest fewer Dallas grade 4 anterior annular disruptions in this sample. Anterior HIZ was correlated with LBP.

High Intensity Areas on Noncontrast T1-Weighted MR Images in Cerebral Infarction

1990 ◽  
Vol 14 (4) ◽  
pp. 521-526 ◽  
Author(s):  
Hidehiko Nabatame ◽  
Naoki Fujimoto ◽  
Kazuo Nakamura ◽  
Yoshio Imura ◽  
Yoshihiro Dodo ◽  
...  
Keyword(s):  
Cerebral Infarction ◽  
High Intensity ◽  
Mr Images
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