scholarly journals Signal intensity ratio of draining vein on silent MR angiography as an indicator of high-flow arteriovenous shunt in brain arteriovenous malformation

2021 ◽  
Author(s):  
Chun-Xue Wu ◽  
Zhen-Xiang Zang ◽  
Tao Hong ◽  
Meng-Qi Dong ◽  
Yi Shan ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Digital Subtraction Angiography ◽  
Transit Time ◽  
Signal Intensity ◽  
Intensity Ratio ◽  
Mr Angiography ◽  
High Flow ◽  
Signal Intensity Ratio ◽  
Digital Subtraction ◽  
Brain Arteriovenous Malformation

Abstract Objectives To evaluate whether the signal intensity ratio (rSI) of the draining vein on silent MR angiography is correlated with arteriovenous (A–V) transit time on digital subtraction angiography (DSA), thereby identifying high-flow A–V shunt in brain arteriovenous malformation (BAVM), and to analyze whether the rSI and the characteristic of draining veins on silent MRA are associated with hemorrhage presentation. Methods Eighty-one draining veins of 46 participants with BAVM (mean age 33.2 ± 16.9 years) who underwent silent MRA and DSA were evaluated retrospectively. The correlation between the rSI of the draining vein on silent MRA and A–V transit time on DSA was examined. The AUC-ROC was obtained to evaluate the performance of the rSI in determining the presence of high-flow A–V shunt. The characteristics of draining veins with the maximum rSI (rSImax) were further compared between the hemorrhagic and non-hemorrhagic untreated BAVM. Results The rSI of each draining vein on silent MRA was significantly correlated with A–V transit time from DSA (r = −0.81, p < .001). The AUC-ROC was 0.89 for using the rSI to determine the presence of high-flow A–V shunt. A cut-off rSI value of 1.09 yielded a sensitivity of 82.4% and a specificity of 82.8%. The draining vein with rSImax and no ectasia was significantly more observed in the hemorrhagic group (p = 0.045). Conclusions The rSI of the draining vein on silent MRA is significantly correlated with A–V transit time on DSA, and it can be used as an indicator of high-flow A–V shunt in BAVM. Key Points • The signal intensity ratio (rSI) of the draining vein on silent MRA significantly correlated with arteriovenous (A–V) transit time of brain arteriovenous malformation (BAVM) on digital subtraction angiography (DSA). • The area under the receiver operating characteristic curve (AUC) was 0.89 for using the rSI of draining veins to determine high-flow A–V shunt. • Draining veins with maximum rSI and no ectasia were significantly more observed in the hemorrhagic group of BAVM (p = 0.045).

scholarly journals Accelerated acquisition of carotid MR angiography using 3D gradient-echo imaging with two-point Dixon

2020 ◽  
Vol 62 (10) ◽  
pp. 1345-1349
Author(s):  
Ryusuke Irie ◽  
Shiori Amemiya ◽  
Tsuyoshi Ueyama ◽  
Yuichi Suzuki ◽  
Kouhei Kamiya ◽  
...  
Keyword(s):  
Signal Intensity ◽  
Intensity Ratio ◽  
Mr Angiography ◽  
Carotid Bifurcation ◽  
Visual Assessment ◽  
Signal Intensity Ratio ◽  
Scan Time ◽  
Signal Change ◽  
Significant Difference ◽  
Gradient Echo Imaging

Abstract This pilot study tests the feasibility of rapid carotid MR angiography using the liver acquisition with volume acceleration-flex technique (LAVA MRA). Seven healthy volunteers and 21 consecutive patients suspected of carotid stenosis underwent LAVA and conventional time-of-flight (cTOF) MRAs. Artery-to-fat and artery-to-muscle signal intensity ratios were manually measured. LAVA MRA exhibited a significantly larger artery-to-fat signal intensity ratio compared with cTOF MRA in all slices (P < 0.001) and exhibited a larger (P < 0.001) or equivalent (P = 1.0) artery-to-muscle signal intensity ratio in the extracranial carotid arteries. The image quality of the cervical carotid bifurcation and the signal change on each MRA were visually assessed and compared among the MRAs. There was no significant difference between the two MRAs in visual assessment. LAVA MRA can provide visualization similar to cTOF MRA in the evaluation of the cervical carotid bifurcation while reducing scan time by one-fifth.

Detection of Predictors of Hemorrhage in Patients with Cerebral Arteriovenous Malformation by Digital Subtraction Angiography

2019 ◽  
Vol 8 (2) ◽  
pp. 87-92
Author(s):  
Fazlul Haque ◽  
Shariful Islam ◽  
Monzurul Haque ◽  
Shafiul Alam ◽  
Raziul Haque
Keyword(s):  
Arteriovenous Malformation ◽  
Digital Subtraction Angiography ◽  
Venous Drainage ◽  
High Flow ◽  
Cerebral Arteriovenous Malformation ◽  
P Value ◽  
Digital Subtraction ◽  
College Hospital ◽  
Multiple Imaging ◽  
Arterial Feeder

Background: Cerebral arteriovenous malformation (AVM) is a complex tangled of dilated blood vessels in which arteries flow directly into veins without capillaries. The main cause of death in patients with cerebral AVM is intraparenchymal hemorrhage. There are multiple imaging tools that can detect the predictors of hemorrhage in cerebralarteriovenous malformation. But nowadays digital subtraction angiography (DSA) is playing a wonderful role to detect these predictors. Objectives: To detect the common predicting factors of hemorrhage from in brain by DSA. Methodology:This observational cross-sectional study was carried out in the department of Neurosurgery, Dhaka Medical College Hospital and study period was from October, 2014 to March, 2016. 76 patients of hemorrhagic stroke with clinical and radiological (CT scan) suspicion of ruptured cerebral AVM were selected by non-probability purposive sampling technique. After that enrolled patients were scrutinized according to selection criteria. Finally selected 50 patients who underwent DSA and were positive for AVM were included in this study. All the included patients’ demographic, clinical and DSA profile were recorded in pre-structured data collection sheet. All the data were compiled, edited and plotted in tabular and figure forms. Data analysis was done by chi-square test. P value was determined significant when it was <0.05. Results: In angiographic presentation, maximum cases were found deep seated (72%), small sized (<3 cm) (70%), having compact type of nidus (58%), having superficial arterial feeder (62%), having high flow draining vein (70%), having deep venous drainage (56%) and single draining vein (78%). Associated aneurysm and venous ectasia were 12% and 4% respectively. The statistically significant predictors were deep location (P=0.036) and superficial arterial feeder (P=0.03) between male and female subjects. Conclusion: Our results showed that small sized, deep-seated Cerebral arteriovenous malformation, having high flow draining vein, having deep venous drainage and single number of draining vein are the possible causes of hemorrhage. Lesions that have associated aneurysms have a risk of bleeding. Bang. J Neurosurgery 2019; 8(2): 87-92

scholarly journals PENDARAHAN BERULANG SETELAH 14 TAHUN PADA MALFORMASI ARTERIOVENA DI SEREBELARIS

2018 ◽  
Vol 35 (4) ◽  
Author(s):  
Ni Nyoman Ayu Trisnadewi ◽  
Kumara Tini
Keyword(s):  
Arteriovenous Malformation ◽  
Ct Scan ◽  
Digital Subtraction Angiography ◽  
High Flow ◽  
Superior Cerebellar Artery ◽  
Recurrent Bleeding ◽  
Digital Subtraction ◽  
Feeding Artery ◽  
Cerebellar Artery ◽  
Superior Petrosal Vein

  THE LATE ONSET RE-BLEEDING AFTER 14 YEARS OF RUPTURE CEREBELLAR AVMABSTRACTThe arteriovenous malformation (AVM), a form of abnormality in brain vascularization, in the cerebellum is a rare disorder. The risk of recurrent bleeding after initial episode at five years is very low about 3,67%. We reported a case of 25 years-old man with history of recurrent bleeding after 14 years with hydrocephalus as complication. The brain CT scan showed a bleeding in the cerebellar vermis  with non-communicant hydrocephalus. The Digital Subtraction Angiography (DSA) showed a moderate left cerebellar AVM with high-flow plexiform nidus, left superior cerebellar artery as primary feeding artery with supplementary supply of the vein draining from the superior cerebellar artery to superior petrosal vein leading to the superior petrosal vein toward the contralateral transverse sinus and left sigmoid sinus. Embolization for infratentorial posterior fossa AVM bleeding needs to be considered even though previous bleeding occurs over 5 years to prevent re-bleeding.Keywords: Arteriovenous malformation, embolization, feeding artery, nidusABSTRAKKelainan pembuluh darah malformasi arteriovena (MAV) pada serebelum merupakan kelainan vaskular yang jarang terjadi. Risiko pendarahan berulang setelah tahun kelima adalah rendah sekitar 3,67%. Dilaporkan suatu kasus laki-laki, 25 tahun, dengan riwayat pendarahan serebri berulang setelah 14 tahun dengan komplikasi hidrosefalus. CT scan kepala menunjukkan adanya pendarahan pada bagian vermis dengan hidrosefalus non-komunikan. Pemeriksaan DSA (digital subtraction angiography) menunjukkan adanya MAV fosa posterior di serebelum kiri ukuran sedang dengan nidus pleksiformis high flow dan feeder utama arteri serebelaris superior kiri ke vena petrosal superior menuju ke sinus transversus kontralateral dan sinus sigmoid kiri. Tata laksana embolisasi pada MAV infratentorial fosa posterior yang mengalami pendarahan perlu dipertimbangkan walaupun pendarahan sebelumnya terjadi lebih dari 5 tahun untuk mencegah pendarahan kembali.Kata kunci: Embolisasi, feeding arteri, malformasi arteriovena, nidus 

Comparison of Biomechanical and Anatomical Effects Following Eccentric and Concentric Exertions

2005 ◽  
Vol 49 (14) ◽  
pp. 1287-1291
Author(s):  
Amrish O. Chourasia ◽  
Mary E. Sesto ◽  
Youngkyoo Jung ◽  
Robert S. Howery ◽  
Robert G. Radwin
Keyword(s):  
Signal Intensity ◽  
Intensity Ratio ◽  
Maximum Voluntary Contraction ◽  
Magnetic Resonance Images ◽  
Voluntary Contraction ◽  
Work Place ◽  
Signal Intensity Ratio ◽  
Mechanical Stiffness ◽  
Average Decrease ◽  
Muscle Shortening

Work place exertions may include muscle shortening (concentric) or muscle lengthening (eccentric) contractions. This study investigates the upper limb mechanical properties and magnetic resonance images (MRI) of the involved muscles following submaximal eccentric and concentric exertions. Twelve participants were randomly assigned to perform at 30° per second eccentric or concentric forearm supination exertions at 50% isometric maximum voluntary contraction (MVC) for 30 minutes. Measurement of mechanical stiffness, isometric MVC, localized discomfort and MRI supinator: extensor signal intensity ratio was done before, immediately after, 1 hour after and 24 hours after the bout of exercise. A 53% average decrease in mechanical stiffness after 1 hour was observed for the eccentric group (p< 0.05) compared to a 1% average decrease for the concentric group (p> 0.05). Edema, indicative of swelling, was observed 24 hrs after exercise, with an average increase in the MRI supinator: extensor signal intensity ratio of 36% for the eccentric group and less than 10% for the concentric group (p<0.05).

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