Limitations of ImageJ When Measuring Signal Intensity of Uniformity Corrected Magnetic Resonance Image

2021 ◽  
Vol 31 (2) ◽  
pp. 33-38
Author(s):  
Kwan-woo Choi
Keyword(s):  
Magnetic Resonance ◽  
Signal Intensity ◽  
Magnetic Resonance Image ◽  
Measuring Signal

Magnetic resonance imagery of a calcaneal lipoma

1995 ◽  
Vol 85 (9) ◽  
pp. 493-496 ◽  
Author(s):  
AA Richardson ◽  
BB Erdmann ◽  
S Beier-Hanratty ◽  
D Lautz ◽  
PM Jacobs ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Signal Intensity ◽  
Magnetic Resonance Image ◽  
Surgical Intervention ◽  
Malignant Degeneration ◽  
Foot And Ankle ◽  
Image Appearance ◽  
Central Calcification ◽  
Short Tau Inversion Recovery ◽  
Apparent Stability

An intraosseous lipoma of the calcaneus has been present and stable in this patient for at least 16 years; the only change has been an increase in the central calcification of the tumor. Because of the apparent stability of the lesion and the patient's complete lack of symptoms, no surgical intervention has been attempted. A baseline magnetic resonance image of the tumor was obtained to confirm the diagnosis and to aid in ruling out malignant degeneration of the tumor. The magnetic resonance image appearance of the calcaneal lipoma; increased signal intensity on T1-weighted images, with areas of decreased signal intensity centrally within the lesion; and corresponding increased signal intensity on the T2-weighted images and Short Tau Inversion Recovery suppression, are consistent with the descriptions from various texts on magnetic resonance imaging of the foot and ankle.

S283 – Invasive Fugal Sinusitis: Pathognomic Presentation in MRI

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P169-P169
Author(s):  
Jinyoung Min ◽  
Seung-Kyu Chung ◽  
Hun-Jong Dhong ◽  
Hyo-Yeol Kim ◽  
Yonggi Jung ◽  
...  
Keyword(s):  
High Risk ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Magnetic Resonance Image ◽  
Fungal Sinusitis ◽  
Mri Findings ◽  
Radiographic Findings ◽  
Invasive Fungal Sinusitis ◽  
Contrast Enhanced ◽  
Histopathologic Findings

Objectives The aim of this study was to evaluate the pathognomic findings of magnetic resonance image(MRI) and determine the benefit of MRI in early diagnosis of invasive fungal sinusitis(IFS). Methods We retrospectively reviewed 15 cases of biopsy-proven IFS. The preoperative MRI was reviewed to identify the pathognomic findings and correlation between radio-graphic and surgical findings were investigated. Results The MRI findings included decreased signal intensity on T1-weighted images with no enhancement on contrast-enhanced images and markedly decreased signal intensity on T2-weighted images in all cases. In our series, the interval between the onset of symptom and timing of MRI was from 48 hours to 2 weeks. Radiographic findings were correlated with histopathologic findings in 13 of 15 patients. Conclusions We could find typical MRI findings in IFS. MRI should be considered early in patients at high risk for IFS.

scholarly journals Simultaneous Bilateral Transient Osteoporosis of the Hip without Pregnancy

2016 ◽  
Vol 2016 ◽  
pp. 1-4
Author(s):  
Yasuaki Okada ◽  
Sachiyuki Tsukada ◽  
Masayoshi Saito ◽  
Atsushi Tasaki
Keyword(s):  
Magnetic Resonance ◽  
Signal Intensity ◽  
Magnetic Resonance Image ◽  
Japanese Woman ◽  
Transient Osteoporosis ◽  
Abnormal Finding ◽  
X Ray ◽  
Bone Marrow Signal ◽  
Old Japanese ◽  
One Year

Transient osteoporosis of the hip (TOH) is a rare disorder characterized by acute severe coxalgia and temporary osteopenia in the proximal femur. Although most cases were unilateral or staged bilateral TOH, some authors reported that the pregnant patients simultaneously had TOH in their bilateral hips. However, there has been no report of simultaneous bilateral TOH in the patient without pregnancy. A 25-year-old Japanese woman without pregnancy had acute simultaneous bilateral hip pain. Plain X-ray of the bilateral hips did not show a periarticular osteopenia. However, magnetic resonance image obtained one week after the onset demonstrated increased T2-weighted signal intensity and decreased T1-weighted signal intensity in the bilateral femoral heads. She was treated conservatively, and follow-up magnetic resonance image at seven weeks after the onset returned to normal bone marrow signal intensity. Her bilateral coxalgia subsided gradually. At one year after the onset, she had no sign of symptomatic flair. Our experience with this case indicates that recognizing the possibility of simultaneous bilateral TOH is important unless the patient is pregnant, and magnetic resonance image is predictable test to make a diagnosis of TOH, even in the absence of abnormal finding on plain X-ray.

Influence of preoperative statins and aspirin administration on biological and magnetic resonance imaging properties in patients with abdominal aortic aneurysm

VASA ◽  
2020 ◽  
pp. 1-9
Author(s):  
Milos Sladojevic ◽  
Petar Zlatanovic ◽  
Zeljka Stanojevic ◽  
Igor Koncar ◽  
Sasenka Vidicevic ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Abdominal Aortic Aneurysm ◽  
Magnetic Resonance ◽  
Aortic Aneurysm ◽  
Signal Intensity ◽  
Psoas Muscle ◽  
Resonance Imaging ◽  
Maximal Diameter ◽  
Aneurysm Wall ◽  
Abdominal Aortic

Summary: Background: Main objective of this study was to evaluate the influence of statins and/or acetylsalicylic acid on biochemical characteristics of abdominal aortic aneurysm (AAA) wall and intraluminal thrombus (ILT). Patients and methods: Fifty patients with asymptomatic infrarenal AAA were analyzed using magnetic resonance imaging on T1w sequence. Relative ILT signal intensity (SI) was determined as a ratio between ILT and psoas muscle SI. Samples containing the full ILT thickness and aneurysm wall were harvested from the anterior surface at the level of the maximal diameter. The concentration of enzymes such as matrix metalloproteinase (MMP) 9, MMP2 and neutrophil elastase (NE/ELA) were analyzed in ILT and AAA wall; while collagen type III, elastin and proteoglycan 4 were analyzed in harvested AAA wall. Oxidative stress in the AAA wall was assessed by catalase and malondialdehyde activity in tissue samples. Results: Relative ILT signal intensity (1.09 ± 0.41 vs 0.89 ± 0.21, p = 0.013) were higher in non-statin than in statin group. Patients who were taking aspirin had lower relative ILT area (0.89 ± 0.19 vs 1.13. ± 0.44, p = 0.016), and lower relative ILT signal intensity (0.85 [0.73–1.07] vs 1.01 [0.84–1.19], p = 0.021) compared to non-aspirin group. There were higher concentrations of elastin in AAA wall among patients taking both of aspirin and statins (1.21 [0.77–3.02] vs 0.78 (0.49–1.05) ng/ml, p = 0.044) than in patients who did not take both of these drugs. Conclusions: Relative ILT SI was lower in patients taking statin and aspirin. Combination of antiplatelet therapy and statins was associated with higher elastin concentrations in AAA wall.

Presurgical Evaluation in Magnetic Resonance Image-Negative Frontal Lobe Epilepsy

2014 ◽  
Vol 45 (S 01) ◽  
Author(s):  
I. Borggräfe ◽  
C. Vollmar ◽  
A. Lösch ◽  
B. Ertl-Wagner ◽  
L. Gerstl ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Frontal Lobe ◽  
Magnetic Resonance Image ◽  
Frontal Lobe Epilepsy ◽  
Presurgical Evaluation

Magnetic resonance image attributes of the bovine ovarian follicle antrum during development and regression

Reproduction ◽  
2000 ◽  
pp. 311-323 ◽  
Author(s):  
JL Hilton ◽  
GE Sarty ◽  
GP Adams ◽  
RA Pierson
Keyword(s):  
Magnetic Resonance ◽  
Relaxation Rate ◽  
Follicular Fluid ◽  
Magnetic Resonance Image ◽  
Follicular Development ◽  
Physiological Status ◽  
Proton Density ◽  
Dominant Follicle ◽  
Rate Heterogeneity ◽  
Pixel Value

The magnetic resonance images and maps of bovine ovaries acquired at defined phases of follicular development and regression were studied to determine whether magnetic resonance image attributes of the follicular antrum reflect the physiological status of dominant and subordinate ovarian follicles. Ovariectomies were performed at day 3 of wave one, day 6 of wave one, day 1 of wave two and at >/= day 17 after ovulation. The timings of ovariectomies were selected to acquire growing, early static, late static and regressing follicles of the first wave and preovulatory follicles of the ovulatory wave. Pre-selection and subordinate follicles were also available for analysis. Serum samples were taken on the day of ovariectomy and follicular fluid samples were taken after imaging. Numerical pixel value and pixel heterogeneity in a spot representing approximately 95% of the follicular antrum were quantified in T(1)- and T(2)-weighted images. T(1) and T(2) relaxation rates (T(1) and T(2)), proton density, apparent diffusion coefficients and their heterogeneities were determined from the computed magnetic resonance maps. The antra of early atretic dominant follicles showed higher T(2)-weighted mean pixel value (P < 0.008) and heterogeneity (P < 0. 01) and lower T(2) heterogeneity (P < 0.008) than growing follicles. Subordinate follicles in the presence of a preovulatory dominant follicle had higher T(1), T(1) heterogeneity, proton density, proton density heterogeneity, and lower mean pixel value in T(1)-weighted images than subordinate follicles of the anovulatory wave (P < 0.04). T(1) relaxation rate heterogeneity and proton density heterogeneity were positively correlated with follicular fluid oestradiol concentration (r = 0.4 and 0.3; P < 0.04). T(2) relaxation rate heterogeneity was positively correlated with follicular fluid progesterone concentration (r = 0.4; P < 0.008). Quantitative differences in magnetic resonance image attributes of the antrum observed among phases of follicular development and regression coincided with changes in the ability of the dominant follicle to produce steroid hormones and ovulate, and thus were indicative of physiological status and follicular health.

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