Acoustic holograms for thalamic focusing through the temporal-bone window

2021 ◽  
Vol 149 (4) ◽  
pp. A118-A118
Author(s):  
Diana Andrés ◽  
Noé Jiménez ◽  
Francisco Camarena
Keyword(s):  
Temporal Bone ◽  
Bone Window

scholarly journals On the Importance of Proper Window and Level Settings in Temporal Bone CT Imaging

2020 ◽  
Vol 35 (2) ◽  
pp. 51
Author(s):  
Nathaniel Yang
Keyword(s):  
Temporal Bone ◽  
Ct Imaging ◽  
Otic Capsule ◽  
Bone Imaging ◽  
Bone Window ◽  
Temporal Bone Ct ◽  
Temporal Bone Imaging ◽  
Exposure Setting

During a discussion on temporal bone imaging, a group of resident trainees in otolaryngology were asked to corroborate the finding of a fracture in set of images that were supposed to be representative of a fracture involving the otic capsule.1 (Figure 1) Their comments included the following statements:“The image still does not clearly identify the fracture. It would have been better if the images were set to the optimal bone window configuration...” “The windowing must be of concern as well. The exposure setting for the non-magnified view is different from the magnified ones. One must observe consistent windowing in order to assess the fractures more accurately.” “...the images which demonstrate a closer look on the otic capsule areas are not rendered in the temporal bone window which makes it difficult to assess.”“...aside from lack of standard windowing...”

Inadequate Acoustical Temporal Bone Window in Patients with a Transient Ischemic Attack or Minor Stroke: Role of Skull Thickness and Bone Density

2008 ◽  
Vol 34 (6) ◽  
pp. 923-929 ◽  
Author(s):  
Annemarie D. Wijnhoud ◽  
Martine Franckena ◽  
Aad van der Lugt ◽  
Peter J. Koudstaal ◽  
en Diederik W.J. Dippel
Keyword(s):  
Bone Density ◽  
Temporal Bone ◽  
Transient Ischemic Attack ◽  
Minor Stroke ◽  
Bone Window ◽  
Ischemic Attack ◽  
Skull Thickness

Abstract WP237: Novel Probe Attached to the Cervix Can Evaluate Right-to-left Shunt More Precisely Than Transcranial Doppler

Stroke ◽  
2017 ◽  
Vol 48 (suppl_1) ◽  
Author(s):  
Hidetaka Mitsumura ◽  
Ayumi Arai ◽  
Teppei Komatsu ◽  
Kenichi Sakuta ◽  
Kenichiro Sakai ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Middle Cerebral Artery ◽  
Temporal Bone ◽  
Cerebral Artery ◽  
Transcranial Doppler ◽  
Common Carotid Artery ◽  
Valsalva Maneuver ◽  
Center Frequency ◽  
Bone Window ◽  
The Right

Introduction: While the examination for the evaluation of right-to-left shunt (RLS) using contrast transcranial Doppler (TCD) is useful, insufficient temporal bone window interrupts the adequate TCD examination for precise diagnosis of RLS. Thus, we developed a novel probe (paste-able soft ultrasound probe; PSUP) attached to the cervix for RLS diagnosis. Hypothesis: Monitoring at carotid artery using PSUP can detect greater number of contrast microembolic signals (cMES) than that of TCD. Methods: Subjects were patients with ischemic stroke or transient ischemic attack who had one and more cMES in middle cerebral artery detected by screening test of TCD on admission. PSUP was a 2.0-MHz center frequency and had an equal property with TCD transducer. The shape was thin, soft, and square modified for adequate attachment to the neck. We monitored blood flow of unilateral middle cerebral artery by TCD and ipsilateral common carotid artery by PSUP simultaneously. After injection of saline agitated with air in the right antecubital vein, we performed single test without Valsalva maneuver (VM) and triple tests with VM. And then, we compared the number of cMES between PSUP and TCD among each patient. Results: We performed 48 simultaneous PSUP and TCD examination (12 studies without VM, and 36 studies with VM) on 12 patients (11 male, median age of 49 years) without any complication. The number of cMES on PSUP was significantly larger than that of TCD in all of 48 examination (345 vs. 206, p<0.001), in 12 studies without VM (72 vs. 37, p=0.017), and in 36 studies with VM (273 vs. 169, p<0.001). Conclusions: In order to evaluate the RLS, PSUP examination at common carotid artery is a powerful approach in comparison with TCD. For patients without sufficient temporal bone window, PSUP should play an important role of RLS diagnosis.

Image Quality of the Temporal Bone Window Examined by Transcranial Doppler Sonography and Correlation with Postmortem Computed Tomography Measurements

2003 ◽  
Vol 17 (1) ◽  
pp. 61-65 ◽  
Author(s):  
József Kollár ◽  
Gernot Schulte-Altedorneburg ◽  
Judit Sikula ◽  
Béla Fülesdi ◽  
E. Bernd Ringelstein ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Temporal Bone ◽  
Transcranial Doppler ◽  
Doppler Sonography ◽  
Transcranial Doppler Sonography ◽  
Postmortem Computed Tomography ◽  
Bone Window

Abstract TP221: A Novel Ultrasound Probe Attached to the Cervix Can Precisely Detect Large Patent Foramen Ovale

Stroke ◽  
2016 ◽  
Vol 47 (suppl_1) ◽  
Author(s):  
Hidetaka Mitsumura ◽  
Ayumi Arai ◽  
Kenichi Sakuta ◽  
Kenichiro Sakai ◽  
Yuka Terasawa ◽  
...  
Keyword(s):  
Temporal Bone ◽  
Patent Foramen Ovale ◽  
Valsalva Maneuver ◽  
Interatrial Septum ◽  
Center Frequency ◽  
Foramen Ovale ◽  
Ultrasound Probe ◽  
Diagnostic Ability ◽  
Bone Window ◽  
The Right

Introduction: We developed a novel probe (paste-able soft ultrasound probe; PSUP) attached to the cervix for detection of right-to-left shunt (RLS), because insufficient temporal bone window interrupts the precise examination for diagnosis of RLS. Hypothesis: We assessed the hypothesis that diagnostic ability of PSUP for RLS detection is equal to those of transesophageal echocardiography (TEE). Methods: Subjects were patients with ischemic stroke and transient ischemic attack who underwent TEE. PSUP was a 2.0-MHz center frequency, which had an equal property with TCD, and the shape was thin, soft, and square modified for attachment to the neck. At first, we performed TEE with the echoscope at the level of the fossa ovalis after injection of saline agitated with air in the right antecubital vein. The procedure was performed with and without Valsalva maneuver. Visualization of microembolic signals (MES) induced contrast agent within the right atrium and crossing the interatrial septum was considered as positive patent foramen ovale (PFO). We divided PFO into two groups according to number of MES, such as small PFO (1-29 of MES) and large PFO (≥30 of MES). Then, monitoring using PSUP was performed at unilateral common carotid artery (CCA) using similar preparation and procedure to TEE. RLS by PSUP diagnosed when we found 1and more MES in CCA. We compared detectable rate by size of PFO between TEE and PSUP, and calculated accuracy of PSUP against TEE. Results: From May 2014 to July 2015, 62 patients (46 male, mean age of 61 years) were included in this study. We diagnosed 26 of 62 patients (42%) as PFO by TEE, whereas PSUP detected in 17 of them (27%). As a reference of TEE findings, diagnostic ability of PSUP was 58% of sensitivity, 94% of specificity, and 79% of accuracy. In TEE examination, large PFO was 11 patients and small was 15 patients. PSUP could evaluate large PFO (9 of 11 patients) more accurately than small one (6 of 15, 82% vs. 40%, p=0.05). Conclusion: PSUP should have a considerable accuracy of large PFO diagnosis. For patients with insufficient temporal bone window, PSUP may play an important role of detecting large PFO.

Complete Basilar Artery Assessment by Transcranial Color-Coded Duplex Sonography Using the Combined Transforaminal and Transtemporal Approach

2011 ◽  
Vol 32 (S 02) ◽  
pp. E63-E68 ◽  
Author(s):  
O. Pade ◽  
J. Eggers ◽  
S. Schreiber ◽  
J. Valdueza
Keyword(s):  
Temporal Bone ◽  
Basilar Artery ◽  
Pulsatile Flow ◽  
Proximal Part ◽  
Duplex Sonography ◽  
Maximum Length ◽  
Vertebral Arteries ◽  
Bone Window ◽  
Color Coded Duplex Sonography

Abstract Purpose: Visualization of the basilar artery (BA) by transcranial color-coded duplex sonography (TCCD) can be challenging. The detection of stenosis or occlusion of the BA often has to rely on indirect signs like a highly pulsatile flow in the vertebral arteries. In case of a distal BA occlusion, however, the flow of the VAs can even be normal. The aim of our TCCD study was to visualize a maximum length of the BA combining the customarily used transforaminal appraoch for the proximal part and the less well known transtemporal coronal approach for the distal BA segment. Materials and Methods: TCCD was performed in 60 subjects with a good temporal bone window. Detectable extracranial or intracranial pathology was previously excluded. The BA was insonated using the transforaminal and transtemporal insonation plane and the visible length was measured. In one subject MRA was performed to substantiate our findings. Results: The BA was visualized in all subjects via both approaches. The maximal detectable BA length via the transforaminal and transtemporal approach was 26 ± 8 mm and 18 ± 5 mm, respectively. Assuming a previously reported average anatomical total BA length of 33 ± 6 mm, we supposed complete vessel visualization in 44 subjects (73 %). Conclusion: The combined transforaminal and transtemporal insonation approach may permit total BA insonation, thus facilitating the evaluation of BA pathology.

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