Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: Susceptibility (air) artifacts rating scale ( left T2-weighted turbo spin-echo images, right transversal echo-planar diffusion weighted images, EPI DWI, with b = 1000 s/mm 2 , arrows resection area with or without T2-hypointense air, stars associated area with or without air artifacts). Air artifacts rating (in the resection area): 0 no air artifacts, 1 small artifacts (e.g. small air bubbles) not affecting more than 5% of the brain tissue, 2 moderate artifacts affecting less than 25% of the neighboring brain tissue, 3 severe artifacts affecting more than 25% of the neighboring brain tissue

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Diffusion-based Assay

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: 3D Slicer segmentation tool. Typical example of different segmentations of postoperative STEAM ( red ) and EPI ( green ) diffusion-weighted images with b = 1000 s/mm 2 . The segmentations are projected onto ( a ) an axial EPI DWI slice and b a reconstructed sagittal STEAM DWI slice of the same patient. The distortion of EPI DWI due to air artifacts in the frontal base of the skull becomes obvious

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Serial Time-encoded Amplified Microscopy, Diffusion-based Assay

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: Measured infarct volumes in diffusion weighted images of stimulated echo acquisition mode (STEAM) and echo-planar imaging (EPI) sequences using 3D Slicer software (group 1 all measured patients, group 2 measured patients with severe air artifact in the resection cavity; group 3 measured patients without severe air artifact in the resection cavity)

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Diffusion-based Assay, Serial Time-encoded Amplified Microscopy, Imaging, Software, Standard Deviation

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: Differences of the mean measured postoperative ischemic volumes in cm 3 using STEAM and EPI DWI. a Patients with air artifacts, b without air artifacts. The shift in the left chart indicates a systematic difference as a result of the missing susceptibility artifacts in STEAM DWI. Dotted line mean difference volume (EPI minus STEAM DWI)

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Serial Time-encoded Amplified Microscopy

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: 23-year-old female. Postoperative b = 1000 s/mm 2 images ( left ) and apparent diffusion coefficient (ADC) maps ( right ) obtained by EPI DWI ( top ) and STEAM DWI ( bottom ) 40 h after resection of an infratentorial arachnoid cyst with compression of the brain stem. In EPI DWI only hyperintensities ( arrows ) of the dorsal mesencephalon caused by susceptibility artifacts were noticed. An infarction could not be excluded. In STEAM DWI air ( asterisk ) and the compression of the brain stem can be detected. An infarction of the mesencephalon could be excluded

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Diffusion-based Assay, Serial Time-encoded Amplified Microscopy

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: Distribution of air and blood artifact in the resection cavity using EPI DWI (echo-planar imaging diffusion weighted imaging)

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Imaging, Diffusion-based Assay

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: Counted infarct lesions using echo-planar imaging (EPI) and stimulated echo acquisition mode (STEAM) diffusion weighted images (DWI). Group 1 contains all measured patients, group 2 is the subgroup of patients with and group 3 the subgroup without severe air artifact in the resection cavity

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Imaging, Serial Time-encoded Amplified Microscopy, Diffusion-based Assay

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: 81-year-old patient. Postoperative diffusion weighted images with b = 1000 s/mm 2 ( left ) and apparent diffusion coefficient (ADC) maps ( right ) obtained by EPI DWI ( top ) and STEAM DWI ( bottom ) 42 h after resection of a glioblastoma of the right parieto-occipital region. The patient presented with trapped air in the ventricular system ( asterisk ) and the resection cavity (+) and with an infarction of the occipital splenium and the parasagittal occipital lobe ( arrows )

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Diffusion-based Assay, Serial Time-encoded Amplified Microscopy

Journal: Clinical Neuroradiology

Article Title: Comparison of EPI DWI and STEAM DWI in Early Postoperative MRI Controls After Resection of Tumors of the Central Nervous System

doi: 10.1007/s00062-023-01261-7

Figure Lengend Snippet: 77-year-old patient. Postoperative diffusion-weighted images with b = 1000 s/mm 2 ( left ) and apparent diffusion coefficient maps ( right ) obtained by EPI DWI ( top ) and STEAM DWI ( bottom ) 71 h after resection of a left temporal astrocytoma. In EPI DWI the border between infarct area ( arrows ), cerebrospinal fluid and air is not clear due to geometric distortion, whereas in STEAM DWI the infarct area ( arrow ) is sharply outlined and even small air bubbles ( asterisk ) can be detected

Article Snippet: Additionally, an axial STEAM DWI sequence (TE 4.53 ms, TR 7.52 ms, 1 × 1 mm in-plane resolution, 3 mm slice thickness, voxel volume 3 mm 3 , 6 gradient directions, 144 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , apparent diffusion coefficient (ADC) map) was applied in tandem with a standard EPI DWI (Siemens 3scan_trace_p2, TE 67 ms, TR 3000 ms, 0.62 × 0.62 mm in-plane resolution, 5.2 mm slice thickness, voxel volume 2 mm 3 , 96 s acquisition time, with DWI acquisition at b = 0 s/mm 2 and b = 1000 s/mm 2 , ADC map) in order to increase the detection rate for postoperative stroke in patients within 72 h after neurosurgery.

Techniques: Diffusion-based Assay, Serial Time-encoded Amplified Microscopy