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461 results on '"Pfeiffer, Christoph"'

11. SQUID magnetometer based on Grooved Dayem nanobridges and a flux transformer

Author

Trabaldo, Edoardo, Pfeiffer, Christoph, Andersson, Eric, Arpaia, Riccardo, Kalaboukhov, Alexei, Winkler, Dag, Lombardi, Floriana, and Bauch, Thilo

Subjects
Condensed Matter - Superconductivity
Abstract

We report noise measurements performed on a SQUID magnetometer implementing Grooved Dayem nanobridge of YBCO as weak-links. The SQUID shows magnetic flux noise as low as 10 $\mu \Phi_0$/Hz$^{0.5}$. The magnetometer is realized by coupling the SQUID to a flux transformer with a two-level coupling scheme using a flip-chip approach. This improves the effective area of the SQUID and result in a magnetic field noise of 50 fT/Hz$^{0.5}$ at T=77 K., Comment: 4 pages, 4 figures

Published
2019
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12. Grooved Dayem nanobridges as building blocks of high-performance YBa$_2$Cu$_3$O$_{7-\delta}$ SQUID magnetometers

Author

Trabaldo, Edoardo, Pfeiffer, Christoph, Andersson, Eric, Arpaia, Riccardo, Kalaboukhov, Alexei, Winkler, Dag, Lombardi, Floriana, and Bauch, Thilo

Subjects
Condensed Matter - Superconductivity
Abstract

We present noise measurements performed on a YBa$_2$Cu$_3$O$_{7-\delta}$ nanoscale weak-link-based magnetometer consisting of a Superconducting QUantum Interference Device (SQUID) galvanically coupled to a $3.5 \times 3.5~$mm$^2$ pick-up loop, reaching white flux noise levels and magnetic noise levels as low as $6~\mu\Phi_0 / \sqrt{\mathrm{Hz}}$ and $100$~fT/$\sqrt{\mathrm{Hz}}$ at $T=77$~K, respectively. The low noise is achieved by introducing Grooved Dayem Bridges (GDBs), a new concept of weak-link. A fabrication technique has been developed for the realization of nanoscale grooved bridges, which substitutes standard Dayem bridge weak links. The introduction of these novel key blocks reduces the parasitic inductance of the weak links and increases the differential resistance of the SQUIDs. This greatly improves the device performance, thus resulting in a reduction of the white noise.

Published
2019
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29. MRI evaluation in acute vestibulo-cochlear disorder

Author

Ilie, Atur, additional, Yassin, Malik, additional, Ibrahim, Mohammad, additional, Pfeiffer, Christoph, additional, Kilgue, Alexander, additional, Riemann, Conrad, additional, Gehl, Hans-Björn, additional, Scholtz, Lars-Uwe, additional, and Todt, Ingo, additional

Published
2024
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48. MRI-Based Inner Ear Assessment and Cochlin Tomoprotein-Based Evaluation of Perilymphatic Fistula in Patients with Sudden Hearing Loss.

Author

Kim, Rayoung, Mihailovic, Denis, Riemann, Conrad, Kilgué, Alexander, Pfeiffer, Christoph Joachim, Gehl, Hans-Björn, Scholtz, Lars-Uwe, and Todt, Ingo

Subjects
SENSORINEURAL hearing loss, MAGNETIC resonance imaging, CONTRAST media, MIDDLE ear, INNER ear
Abstract

Objectives: To study the correlation between positive cochlin tomoprotein testing (CTP), magnetic resonance (MR) imaging, and the auditory and vestibular function amongst patients with sudden hearing loss. Study Design: Prospective case series. Methods: We prospectively examined eight patients who presented with sudden hearing loss (>60 dB) with or without vertigo or tinnitus. We performed an ELISA-based CTP detection test using middle ear lavage samples. In addition to the CTP examination, a magnetic resonance imaging (MRI) examination was performed using different sequences (T1 and a T1 sequence with a contrast medium (CM), a T2 sequence, 4 h delayed intravenous gadolinium-enhanced three-dimensional fluid-attenuated inversion recovery (3D FLAIR)). Results: All patients with sudden hearing loss (>60 dB) presented a non-specific contrast enhancement in the cochlea and vestibulum on the affected side on delayed 3D-FLAIR MRI. Four patients had a positive CTP test, suggesting a perilymphatic fistula (PLF). However, no specific MRI signal for a PLF was observed. Conclusions: Using multimodal diagnostic measures, such as CTP testing and different MRI sequences, no correlation could be found in patients with a PLF. [ABSTRACT FROM AUTHOR]

Published
2024
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49. First Clinical Experience with a New Device for the Removal of Cochlear Schwannomas.

Author

Pfeiffer, Christoph J., Riemann, Conrad, Kim, Rayoung, Scholtz, Lars-Uwe, Schürmann, Matthias, and Todt, Ingo

Subjects
*NEUROFIBROMATOSIS 2, *SCHWANNOMAS, *ACOUSTIC stimulation, *TEMPORAL bone, *COCHLEAR implants, *COCHLEA
Abstract

Background: In most cases, intralabyrinthine schwannoma (ILS) occurs in patients with unilateral hearing deterioration or neurofibromatosis type II (NF II). The pattern of localization of these tumors varies but mostly affects the cochlea. Extirpation of the cochlear schwannoma, if hidden by the cochlea modiolus, is difficult under the aspect of complete removal. Therefore, a tissue removal device (TRD) was designed and tested in temporal bones. The principle of handling the new device is a pushing and pipe cleaner handling inside the cochlea. This present study aimed to describe the first in vivo experience with the newly developed TRD for removing cochlear intralabyrinthine schwannomas. Methods: In three patients, the TRD was used for the tumor removal of cochlear schwannomas. In two patients with a cochlear schwannoma in combination with a cochlea implantation and one patient suffering from NF II, a cochlear schwannoma was removed with the TRD. The access was performed with a posterior tympanotomy, an enlarged round window approach and an additional second turn access. The device was inserted and extracted gradually from the second turn access until the rings were visible in the second turn access. By pushing and pipe cleaner handling, the tumors were removed. An MRI control was performed on the day postoperatively with a T1 GAD sequence. Results: Tumor removal with the TRD was performed in a 15-min procedure without any complications. An MRI control confirmed complete removal on the postoperative day in all cases. Conclusions: In vivo handling of the device confirmed straightforward handling for the tumor removal. MRI scanning showed complete removal of the tumor by the TRD. [ABSTRACT FROM AUTHOR]

Published
2024
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50. On-Scalp MEG

Author

Schneiderman, Justin F., Ruffieux, Silvia, Pfeiffer, Christoph, Riaz, Bushra, Supek, Selma, editor, and Aine, Cheryl J., editor

Published
2019
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