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Article ; Online: Potential benefits of intraoperative ultrasound in neurosurgery.

Olah, Laszlo / Olah, Marton

2023 Volume 51, Issue 4, Page(s) 739–741

Abstract: Computed tomography and magnetic resonance imaging are the most popular diagnostic tools to visualize intracranial pathology and help surgical planning in the neurosurgical practice. However, these preoperative techniques need to be supplemented with ... ...

Abstract	Computed tomography and magnetic resonance imaging are the most popular diagnostic tools to visualize intracranial pathology and help surgical planning in the neurosurgical practice. However, these preoperative techniques need to be supplemented with intraoperative methods, if the lesion size may increase or preoperative anatomy may change after the primary imaging due to rapid progression of the underlying intracranial disease. In such situations intraoperative ultrasound could be a valuable technique in real-time imaging of intracranial pathologic processes, real-time control of surgical procedure, assistance in drain or catheter placement, and real-time assessment of residual tumor or hematoma volume during neurosurgical interventions.
MeSH term(s)	Humans ; Neurosurgery/methods ; Brain Neoplasms/diagnostic imaging ; Brain Neoplasms/surgery ; Neurosurgical Procedures/methods ; Ultrasonography ; Magnetic Resonance Imaging
Language	English
Publishing date	2023-01-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	189393-2
ISSN	1097-0096 ; 0091-2751
ISSN (online)	1097-0096
ISSN	0091-2751
DOI	10.1002/jcu.23429
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Article ; Online: Az endovascularis terápia szerepe és jelentősége a stroke-ellátási láncban.

Szabó-Maák, Zoltán / Kis, Balázs / Oláh, László

Orvosi hetilap

2024 Volume 165, Issue 1, Page(s) 14–23

Title translation	The role of endovascular treatment in acute ischemic stroke - a multidisciplinary approach.
MeSH term(s)	Humans ; Ischemic Stroke
Language	Hungarian
Publishing date	2024-01-07
Publishing country	Hungary
Document type	Journal Article
ZDB-ID	123879-6
ISSN	1788-6120 ; 0030-6002
ISSN (online)	1788-6120
ISSN	0030-6002
DOI	10.1556/650.2024.32952
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Article ; Online: Muographic monitoring of hydrogeomorphic changes induced by post-eruptive lahars and erosion of Sakurajima volcano.

Oláh, László / Tanaka, Hiroyuki K M / Hamar, Gergő

Scientific reports

2021 Volume 11, Issue 1, Page(s) 17729

Abstract: Post-eruptive destabilization of volcanic edifices by gravity driven debris flows or erosion can catastrophically impact the landscapes, economies and human societies surrounding active volcanoes. In this work, we propose cosmic-ray muon imaging ( ... ...

Abstract	Post-eruptive destabilization of volcanic edifices by gravity driven debris flows or erosion can catastrophically impact the landscapes, economies and human societies surrounding active volcanoes. In this work, we propose cosmic-ray muon imaging (muography) as a tool for the remote monitoring of hydrogeomorphic responses to volcano landscape disturbances. We conducted the muographic monitoring of Sakurajima volcano, Kyushu, Japan and measured continuous post-eruptive activity with over 30 lahars per year. The sensitive surface area of the Multi-Wire-Proportional-Chamber-based Muography Observation System was upgraded to 7.67 m[Formula: see text]; this made it possible for the density of tephra within the crater region to be measured in 40 days. We observed the muon flux decrease from 10 to 40% through the different regions of the crater from September 2019 to October 2020 due to the continuous deposition of tephra fallouts. In spite of the long-term mass increase, significant mass decreases were also observed after the onsets of rain-triggered lahars that induced the erosion of sedimented tephra. The first muographic observation of these post-eruptive phenomena demonstrate that this passive imaging technique has the potential to contribute to the assessment of indirect volcanic hazards.
Language	English
Publishing date	2021-09-06
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-021-96947-8
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Article: Role of carotid duplex in the assessment of carotid artery restenosis after endarterectomy or stenting.

Szegedi, István / Potvorszki, Fanni / Mészáros, Zsófia Réka / Daniel, Cecilia / Csiba, László / Oláh, László

Frontiers in neurology

2023 Volume 14, Page(s) 1226220

Abstract: Introduction: Redo carotid endarterectomy (CEA) and carotid stenting (CAS) are often performed when there is evidence of post-procedural restenosis. The incidence of restenosis after carotid reconstruction is not negligible, ranging from 5 to 33%. The ... ...

Abstract	Introduction: Redo carotid endarterectomy (CEA) and carotid stenting (CAS) are often performed when there is evidence of post-procedural restenosis. The incidence of restenosis after carotid reconstruction is not negligible, ranging from 5 to 33%. The diagnosis of significant internal carotid artery (ICA) restenosis is usually based on duplex ultrasound (US) criteria, mostly on peak-systolic flow velocity (PSV). However, there have been no generally accepted duplex US criteria for carotid restenosis after CAS or CEA. Methods: In this systematic review, the PubMed/ Medline and Scopus databases were screened to find trials that reported duplex US criteria for significant restenosis after CEA and/or CAS. Only those reports were analyzed in which the restenoses were also assessed by CT/MR or digital subtraction angiography as comparators for duplex US. Results: Fourteen studies met the predetermined search criteria and were included in this review. In most studies, PSV thresholds for significant in-stent ICA restenosis after CAS were higher than those for significant stenosis in non-procedurally treated (native) ICA. Many fewer studies investigated the US criteria for ICA restenosis after CEA. Despite the heterogeneous data, there is a consensus to use higher flow velocity thresholds for assessment of stenosis in stented ICA than in native ICA; however, there have been insufficient data about the flow velocity criteria for significant restenosis after CEA. Although the flow velocity thresholds for restenosis after CAS and CEA seem to be different, the large studies used the same duplex criteria to define restenosis after the two procedures. Moreover, different studies used different flow velocity thresholds to define ICA restenosis, leading to variable restenosis rates. Discussion: We conclude that (1) further examinations are warranted to determine appropriate duplex US criteria for restenosis after CAS and CEA, (2) single duplex US parameter cannot be used to reliably determine the degree of ICA restenosis, (3) inappropriate US criteria used in large studies may have led to false restenosis rates, and (4) studies are required to determine if there is a benefit from redo carotid artery procedure, such as redo-CEA or redo-CAS, starting with prospective risk stratification studies using current best practice non-invasive care alone.
Language	English
Publishing date	2023-10-27
Publishing country	Switzerland
Document type	Systematic Review
ZDB-ID	2564214-5
ISSN	1664-2295
ISSN	1664-2295
DOI	10.3389/fneur.2023.1226220
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Article ; Online: Structural health monitoring of sabo check dams with cosmic-ray muography.

Oláh, László / Tanaka, Hiroyuki K M / Mori, Toshio / Sakatani, Yukihiko / Varga, Dezső

iScience

2023 Volume 26, Issue 10, Page(s) 108019

Abstract: Debris dams have a crucial role in consolidation of river basins and allow erosion control, flood protection in mountainous areas. Many of these infrastructures have operated over five decades, thus structural health monitoring (SHM) of these ... ...

Abstract	Debris dams have a crucial role in consolidation of river basins and allow erosion control, flood protection in mountainous areas. Many of these infrastructures have operated over five decades, thus structural health monitoring (SHM) of these infrastructures became timely due to their aging. Utilizing new techniques is required for inspecting a large number of dams and deciding about their reinforcement or reconstruction. In this work, we propose cosmic-ray muography as a complementary tool for the SHM of debris dams. We conducted the first muographic surveying of a sabo check dam in the Karasu River, Gunma, Japan. The average mass density image was produced with a spatial resolution of 0.5 m through the dam. The comparison of density data reconstructed by muography and gamma-ray logging suggest the internal deterioration of dam in the region where cement released out from the embankment body.
Language	English
Publishing date	2023-09-22
Publishing country	United States
Document type	Journal Article
ISSN	2589-0042
ISSN (online)	2589-0042
DOI	10.1016/j.isci.2023.108019
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Article ; Online: Hemorrhagic Transformation of Ischemic Strokes.

Kovács, Kitti Bernadett / Bencs, Viktor / Hudák, Lilla / Oláh, László / Csiba, László

International journal of molecular sciences

2023 Volume 24, Issue 18

Abstract: Ischemic stroke, resulting from insufficient blood supply to the brain, is among the leading causes of death and disability worldwide. A potentially severe complication of the disease itself or its treatment aiming to restore optimal blood flow is ... ...

Abstract	Ischemic stroke, resulting from insufficient blood supply to the brain, is among the leading causes of death and disability worldwide. A potentially severe complication of the disease itself or its treatment aiming to restore optimal blood flow is hemorrhagic transformation (HT) increasing morbidity and mortality. Detailed summaries can be found in the literature on the pathophysiological background of hemorrhagic transformation, the potential clinical risk factors increasing its chance, and the different biomarkers expected to help in its prediction and clinical outcome. Clinicopathological studies also contribute to the improvement in our knowledge of hemorrhagic transformation. We summarized the clinical risk factors of the hemorrhagic transformation of ischemic strokes in terms of risk reduction and collected the most promising biomarkers in the field. Also, auxiliary treatment options in reperfusion therapies have been reviewed and collected. We highlighted that the optimal timing of revascularization treatment for carefully selected patients and the individualized management of underlying diseases and comorbidities are pivotal. Another important conclusion is that a more intense clinical follow-up including serial cranial CTs for selected patients can be recommended, as clinicopathological investigations have shown HT to be much more common than clinically suspected.
Language	English
Publishing date	2023-09-14
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms241814067
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Article ; Online: Overview of muographers.

Tanaka, Hiroyuki K M / Oláh, László

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

2018 Volume 377, Issue 2137

Abstract: By observing the growth of a research community, particularly the factors of size and strength of involvement, it is possible to evaluate the vitality of a new field. The emerging technology of muography, a new visualization technique to look through ... ...

Abstract	By observing the growth of a research community, particularly the factors of size and strength of involvement, it is possible to evaluate the vitality of a new field. The emerging technology of muography, a new visualization technique to look through gigantic objects with an elementary particle called the muon, is the focus of this study. Recently, the initial applications of muography to the study of structures such as pyramids and volcanoes have been expanding to include more commercial interests such as inspecting social infrastructures and energy and mineral resources. Evolutions of the research networks of muography will be discussed with particular attention to the chronological and lateral structures that could be an indicator of the development of this new technology.This article is part of the Theo Murphy meeting issue 'Cosmic-ray muography'.
Language	English
Publishing date	2018-12-10
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	208381-4
ISSN	1471-2962 ; 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
ISSN (online)	1471-2962
ISSN	0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
DOI	10.1098/rsta.2018.0143
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Article: The applications of transcranial Doppler in ischemic stroke.

Finnsdóttir, Herdis / Szegedi, István / Oláh, László / Csiba, László

Ideggyogyaszati szemle

2020 Volume 73, Issue 11-12, Page(s) 367–378

Abstract: Background: This overview provides a summary of the applications of transcranial Doppler (TCD) in ischemic stroke.: Results: A fast-track neurovascular ultrasound protocol has been developed for detecting occlusion or stenosis. The technique is more ... ...

Title translation	A transcranialis Doppler-ultrahang alkalmazása ischaemiás stroke-ban.
Abstract	Background: This overview provides a summary of the applications of transcranial Doppler (TCD) in ischemic stroke. Results: A fast-track neurovascular ultrasound protocol has been developed for detecting occlusion or stenosis. The technique is more reliable in the carotid area than in the posterior circulation. By monitoring the pulsatility index the in-crea-sed intracranial pressure can be diagnosed. TIBI score was developed for grading residual flow. TCD has been shown to accurately predict complete or any recanalization. Regarding recanalization, TCD has a sensitivity of 92%, a specificity of 88%, a positive predictive value of 96%, a negative predictive value of 78% and an overall accuracy of 91%, respectively. Sonothrombolysis seemed to be a promising application but randomized controlled trials have shown that it does not improve clinical outcome. TCD examination can detect microembolic signals (MES) which are associated with an increased risk of stroke. Micro-em-boli were detected in symptomatic and asymptomatic carotid artery stenosis and during carotid endarterectomy. The number of microemboli can be decreased by antithrombotic therapy. Contrast en-chan-ced examination and Valsalva maneuver with continuous TCD monitoring can accurately screen for right-to-left shunt.
MeSH term(s)	Brain Ischemia/diagnostic imaging ; Carotid Stenosis ; Humans ; Ischemic Stroke/diagnostic imaging ; Stroke ; Ultrasonography, Doppler, Transcranial/methods
Language	English
Publishing date	2020-12-02
Publishing country	Hungary
Document type	Journal Article ; Review
ZDB-ID	2240317-6
ISSN	0019-1442
ISSN	0019-1442
DOI	10.18071/isz.73.0367
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Article: Use of Transcranial Doppler in Intensive Care Unit.

Viski, Sandor / Olah, Laszlo

Journal of critical care medicine (Universitatea de Medicina si Farmacie din Targu-Mures)

2017 Volume 3, Issue 3, Page(s) 99–104

Abstract: Use of transcranial Doppler has undergone much development since its introduction in 1982, making the technique suitable for general use in intensive care units. The main application in intensive care units is to assess intracranial pressure, confirm the ...

Abstract	Use of transcranial Doppler has undergone much development since its introduction in 1982, making the technique suitable for general use in intensive care units. The main application in intensive care units is to assess intracranial pressure, confirm the lack of cerebral circulation in brain death, detect vasospasm in subarachnoid haemorrhage, and monitor the blood flow parameters during thrombolysis and carotid endarterectomy, as well as measuring stenosis of the main intracranial arteries in sickle cell disease in children. This review summarises the use of transcranial Doppler in intensive care units.
Language	English
Publishing date	2017-08-19
Publishing country	Poland
Document type	Journal Article ; Review
ISSN	2393-1809
ISSN	2393-1809
DOI	10.1515/jccm-2017-0021
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Article: Comparison of pre-mortem 2D-3D ultrasound examination to post-mortem micro-CT of carotid arteries - first experiences.

Szegedi, István / Szabó, Dániel András / Emri, Miklós / Béresova, Mónika / Nagy, Mariann / Molnár, Sarolta / Nagy, Attila / Berényi, Ervin / Oláh, László / Csiba, László

Ideggyogyaszati szemle

2024 Volume 77, Issue 1-2, Page(s) 13–20

Abstract: Background and purpose: ... A prerequisite for the treatment of carotid atherosclerosis is the accurate measurement of the stenosis, that is most commonly evaluated by duplex ultrasonography. In this study, we aimed to verify the reliability of 2D and 3D ...

Title translation	Carotis artériák premortem 2D-3D ultrahangvizsgálatának és post mortem mikro-CT-vizsgálatának összehasonlítása – első tapasztalataink.
Abstract	Background and purpose: A prerequisite for the treatment of carotid atherosclerosis is the accurate measurement of the stenosis, that is most commonly evaluated by duplex ultrasonography. In this study, we aimed to verify the reliability of 2D and 3D ultrasonography, comparing the data to results of post-mortem micro-CT examination. . Methods: Neurological patients with any life-threatening, presumably fatal neurological disease were enrolled. Ultrasound examinations were performed with a Philips Epiq 5G machine, using a VL13-5 broadband linear volume array transducer. Plaque length, diameter and vessel area reduction (stenosis) were calculated using the 2D images. Finally, the stenosis was reassessed using automatized, 3D application as well. After the death of the patient, autopsy was performed, during which the previously examined carotid artery was removed. The samples were examined with micro-CT. Similar to the ultrasound examination, plaque length, diameter and vessel area reduction (stenosis) were determined. . Results: Ten vessels of seven patients were eligible for complex comparison. Plaque diameter and length measured by CT did not correlate with the ultrasound data. CT-measured axial plaque and vessel areas showed no correlation with ultrasound results either. While determining the strength of correlation between stenoses measured by the different modalities, significant correlation was found between the results measured by ultrasound (2D) and CT (Pearson r: 0.902, P<0.001). . Conclusion: Three-dimensional ultrasound analysis is a spectacular method for examining carotid plaques, as it can assist in a more detailed evaluation of the plaque morphology and composition, thereby identifying plaques with a particularly high risk of stroke. Micro-CT is an excellent tool for the exact determination of calcified plaque areas, but ultrasound images are not suitable yet for such a precise examination due to acoustic shadowing and artifacts. .
MeSH term(s)	Humans ; X-Ray Microtomography ; Constriction, Pathologic ; Reproducibility of Results ; Imaging, Three-Dimensional/methods ; Carotid Arteries/diagnostic imaging ; Ultrasonography/methods ; Autopsy ; Carotid Stenosis/diagnosis
Language	English
Publishing date	2024-02-06
Publishing country	Hungary
Document type	Journal Article
ZDB-ID	2240317-6
ISSN	0019-1442
ISSN	0019-1442
DOI	10.18071/isz.77.0013
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