Spinal Arteriovenous Malformation: Evaluation of Change in Venous Oxygenation with Susceptibility-weighted MR Imaging after Treatment

Fujima, Noriyuki; Kudo, Kohsuke; Terae, Satoshi; Hida, Kazutoshi; Ishizaka, Kinya; Zaitsu, Yuri; Asano, Takeshi; Yoshida, Daisuke; Tha, Khin Khin; Haacke, E. Mark; Sasaki, Makoto; Shirato, Hiroki

doi:10.1148/radiol.09090286

Cited by 20 publications

(18 citation statements)

References 21 publications

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“…The phase value measurements of the candidate vein ( V ) and surrounding tissue ( T ) were based on methods proposed by Fan et al 16 and Fujima et al 19 V and T were measured in ROIs by using a square ROI (20 ϫ 20 pixels) containing the gray matter candidate vein placed on the phase image (Fig 2). When the length of the vessel exceeds 6ϫ its diameter, it can be fitted to the longcylinder model in MR susceptometry.…”

Section: Image Processingmentioning

confidence: 99%

“…The definition of V was the darkest pixel or the average of at least 4 dark pixels of similar phase value in the largest vessels (Fig 2). 16,19 Estimation of T was by using the average phase value up to the threshold value (mean Ϯ 2 SDs) in the ROI. 16,19 For 1 candidate vein, V and T were measured 3 times by an experimenter who was blinded to the vascular results and the values were averaged.…”

Section: Image Processingmentioning

confidence: 99%

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Cortical Cerebral Blood Flow, Oxygen Extraction Fraction, and Metabolic Rate in Patients with Middle Cerebral Artery Stenosis or Acute Stroke

Liu

2015

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE:With the advances of magnetic resonance technology, the CBF, oxygen extraction fraction, and cerebral metabolic rate of oxygen can be measured in MRI. Our aim was to measure the CBF, oxygen extraction fraction, and cerebral metabolic rate of oxygen use in patients with different severities of middle cerebral artery stenosis or acute stroke by using the arterial spin-labeling and susceptibility-weighted imaging techniques.

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Section: Image Processingmentioning

confidence: 99%

Section: Image Processingmentioning

confidence: 99%

Cortical Cerebral Blood Flow, Oxygen Extraction Fraction, and Metabolic Rate in Patients with Middle Cerebral Artery Stenosis or Acute Stroke

Liu

2015

AJNR Am J Neuroradiol

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“…For example, patients with spinal arteriovenous malformations (AVM) exhibit increased oxygen saturation in the draining vein. Normalized oxygen saturation in the draining vein can be detected by SWI (Fujima et al, 2010). In the case of patients with multiple sclerosis (MS), decreased oxygen uptake leading to decreased venous vasculature in the brain was assessed by using SWI (Ge et al, 2009), and this technique can be applied to spinal MS as well.…”

Section: Introductionmentioning

confidence: 99%

Non-invasive measurement of oxygen saturation in the spinal vein using SWI: Quantitative evaluation under conditions of physiological and caffeine load

et al. 2011

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“…Several studies have described the long acquisition times required to obtain an SW image, 15,31,33,50,57,65,66,80,92,99,100,115 which makes movement artifacts likely to occur because of patient discomfort, which subsequently distorts SWI findings.…”

Section: Limitations Of Swimentioning

confidence: 99%

“…The use of higher magnetic fields in SWI protocols at 3 T or 7 T 15 and the application of parallel acquisition when obtaining SWI data are promising methods suggested to greatly reduce the required imaging time; 31,92,99 however, further reduction in acquisition times remains a major priority.…”

Section: 5792100mentioning

confidence: 99%

Magnetic resonance susceptibility weighted imaging in neurosurgery: current applications and future perspectives

Ieva¹,

Lam²,

Alcaide‐Leon

et al. 2015

JNS

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T he initial development of MR venography by Reichenbach et al. 90 laid the foundation for Haacke et al. 42 to apply the principles of MR venography in conventional MRI for broader usage in clinical and research settings. By utilizing magnitude and phase information, both of which are normally acquired from conventional MRI data, susceptibility weighted imaging (SWI) has an enhanced ability to detect microhemorrhages 4,12,26 and microvasculature. 26,27,41,92 It is a highly sensitive imaging modality able to depict magnetic substances, such as deoxygenated hemoglobin, with high contrast 42 and to help investigate neurological diseases, 82 grade tumors, 25,63 and assist in determining treatment or prognosis. 18,26,37,70,71,115 Over the past years, the SWI technique has found applications in the different fields of neurosurgery, namely neurooncology, vascular neurosurgery, neurotraumatolabbreviatioNs AVM = arteriovenous malformation; CCM = cerebral cavernous malformation; CMB = cerebral microbleed; CVS = cortical vessel sign; DAI = diffuse axonal injury; DBS = deep brain stimulation; DWI = diffusion-weighted imaging; GBM = glioblastoma multiforme; GCS = Glasgow Coma Scale; GPe = external globus pallidus; GPi = internal GP; GRE = gradient-recalled echo; ITSS = intratumoral susceptibility signal; mIP = minimum intensity projection; MRA = MR angiography; MS = multiple sclerosis; PD = proton density; PQ = percentagewise quantification; PWI = perfusion-weighted imaging; SN = substantia nigra; STN = subthalamic nucleus; SWI = susceptibility weighted imaging; TBI = traumatic brain injury; VM = vascular malformation. Susceptibility weighted imaging (SWI) is a relatively new imaging technique. Its high sensitivity to hemorrhagic components and ability to depict microvasculature by means of susceptibility effects within the veins allow for the accurate detection, grading, and monitoring of brain tumors. This imaging modality can also detect changes in blood flow to monitor stroke recovery and reveal specific subtypes of vascular malformations. In addition, small punctate lesions can be demonstrated with SWI, suggesting diffuse axonal injury, and the location of these lesions can help predict neurological outcome in patients. This imaging technique is also beneficial for applications in functional neurosurgery given its ability to clearly depict and differentiate deep midbrain nuclei and close submillimeter veins, both of which are necessary for presurgical planning of deep brain stimulation. By exploiting the magnetic susceptibilities of substances within the body, such as deoxyhemoglobin, calcium, and iron, SWI can clearly visualize the vasculature and hemorrhagic components even without the use of contrast agents. The high sensitivity of SWI relative to other imaging techniques in showing tumor vasculature and microhemorrhages suggests that it is an effective imaging modality that provides additional information not shown using conventional MRI. Despite SWI's clinical advantages, its implementation in MRI protocols is st...

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Spinal Arteriovenous Malformation: Evaluation of Change in Venous Oxygenation with Susceptibility-weighted MR Imaging after Treatment

Abstract: After treatment, normalization of increased oxygen saturation was noninvasively observed by using SW imaging in patients with spinal AVM. SW imaging can be a useful tool for the assessment of treatment efficacy in patients with spinal AVM. (c) RSNA, 2010.

Cited by 20 publications

References 21 publications

Cortical Cerebral Blood Flow, Oxygen Extraction Fraction, and Metabolic Rate in Patients with Middle Cerebral Artery Stenosis or Acute Stroke

Cortical Cerebral Blood Flow, Oxygen Extraction Fraction, and Metabolic Rate in Patients with Middle Cerebral Artery Stenosis or Acute Stroke

Non-invasive measurement of oxygen saturation in the spinal vein using SWI: Quantitative evaluation under conditions of physiological and caffeine load

Magnetic resonance susceptibility weighted imaging in neurosurgery: current applications and future perspectives

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