Research

Our technology and proof of concept are founded in a series of published clinical studies and peer reviewed papers.

Conference presentation/Abstract

6th Congress of joint European Neonatal Societies 2025

Continuous Cerebral Doppler Monitoring Reveals Novel Insights into Cerebral Hemodynamics in Asphyxiated Neonates

Sophie van Someren, Hester Rijkje Berger, Hans Torp, Siri Ann Nyrnes, Thomas Alderliesten, Jeroen Dudink

Conference presentation/Abstract

Innovations in Pediatric Cardiovascular Ultrasound and Brain Perfusion - BACUS Symposium 2025.

NeoDoppler – how and why?

Keynote lecture, Nyrnes SA

Conference presentation/Abstract

9th World Congress of Pediatric Cardiology and Cardiac Surgery (WCPCCS) 2025:

NeoDoppler instantly displays cerebral blood flow velocities during cardiac surgery and intensive care

Kclovansky J, Torp H, Nyrnes SA

Master thesis

Heart rate variability in healthy neonates measured by NeoDoppler

Helene Synnes, Ada Søvik Rønnestad. Supervisors: Siv Steinsmo Ødegård, Siri Ann Nyrnes

New ultrasound technology for continuous monitoring of cerebral blood flow in neonates

Sigrid Dannheim Vik. Supervisors: Siri Ann Nyrnes, Ragnhild Støen, Hans Torp

Popular science articles

NeoDoppler best innovation project 2025

Dec 19, 2025

Continuous cerebral Doppler monitoring in infants with congenital heart disease

Martin Leth-Olsen. Supervisors: Siri Ann Nyrnes, Gaute Døhlen, Hans Torp

Original Research paper

Perioperative Detection of Cerebral Fat Emboli From Bone Using High-Frequency Doppler Ultrasound

Anders Hagen Jarmund, Steinar Kristiansen, Martin Leth-Olsen, Christina Vogt, Ingunn Nervik, Hans Torp, Erik Waage Nielsen, Siri Ann Nyrnes.

Original Research paper

Instant Detection of Cerebral Blood Flow Changes in Infants with Congenital Heart Disease during Transcatheter Interventions

Martin Leth-Olsen,Gaute Døhlen,Hans Torp and Siri Ann Nyrnes

Continuous monitoring of cerebral blood flow during general anaesthesia in infants

Sigrid D. Vik, Hans Torp, Anders H. Jarmund, Gabriel Kiss, Turid Follestad, Ragnhild Støen, Siri Ann Nyrnes. Doi: 10.1016/j.bjao.2023.100144 BJA Open, 6 (C): 100144 (2023) Received: 3 February 2023; Accepted: 22 April 2023

NeoDoppler: New ultrasound technology for continuous cerebral circulation monitoring in neonates

Vik SD, Torp H, Follestad T, Støen R, Nyrnes SA. NeoDoppler: New ultrasound technology for continous cerebral circulation monitoring in neonates. Pediatr Res. 2020 Jan;87(1):95-103. doi: 10.1038/s41390-019-0535-0. Epub 2019 Aug 12.

Effects of tilt on cerebral hemodynamics measured by NeoDoppler in healthy neonates

Jarmund AH, Ødegård SS, Torp H, Nyrnes SA. Effects of tilt on cerebral hemodynamics measured by NeoDoppler in healthy neonates. Pediatr Res. 2021 Oct;90(4):888-895.

Detection of Cerebral High-Intensity Transient Signals by NeoDoppler during Cardiac Catheterization and Cardiac Surgery in Infants

Leth-Olsen M, Døhlen G, Torp H, Nyrnes SA. Detection of Cerebral High-Intensity Transient Signals by NeoDoppler during Cardiac Catheterization and Cardiac Surgery in Infants. Ultrasound Med Biol. 2022 Jul;48(7):1256-1267.

Low frequency cerebral arterial and venous flow oscillations in healthy neonates measured by NeoDoppler

Ødegård SS, Torp H, Follestad T, Leth-Olsen M, Støen R, Nyrnes SA. Low frequency cerebral arterial and venous flow oscillations in healthy neonates measured by NeoDoppler. Front. Pediatr. 2022 Nov. doi: 10.3389/fped.2022.929117.

A Scoping Review of Cerebral Doppler Arterial Waveforms in Infants

Jarmund AH, Pedersen SA, Torp H, Dudink J, Nyrnes SA. A Scoping Review of Cerebral Doppler Arterial Waveforms in Infants. Ultrasound Med Biol. 2023 Apr;49(4):919-936. doi: 10.1016/j.ultrasmedbio.2022.12.007. Epub 2023 Jan 31.

Abstracts

Monitoring of cerebral high intensity transient signals during catheter interventions and surgery for congenital heart disease in infants using NeoDoppler

M. Leth-Olsen, G. Døhlen, H. Torp, S.A. Nyrnes. Poster EACVI Best In Imaging.

Low frequency cerebral arterial and venous flow oscillations in healthy neonates masured by NeoDoppler

S. S. Ødegård, H. Torp, T. Follestad, M. Leth-Olsen, R. Støen, S.A. Nyrnes. Low frequency oscillations PAS

NeoDoppler–Continuous cerebral blood flow monitoring during cardiac surgery and interventions in children with congenital heart disease

M. Leth-Olsen, G. Døhlen, Guro Grindheim, H. Torp, S.A. Nyrnes. NeoDoppler – Continuous cerebral blood flow monitoring – MLO

NeoDoppler monitoring of cerebral blood flow during general anesthesia in infants

Sigrid D. Vik, Hans Torp, Dr. Tech, Prof1, Ragnhild Støen, MD, PhD, Prof, and Siri Ann Nyrnes MD, PhD