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						<h1 itemprop="headline">&quot;Optical magnetometry for MRI&quot; by Hans Stærkind</h1>
						
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							<p class="text--intro" itemprop="description">Optical magnetometry has emerged as a powerful tool for non-invasive, high-resolution magnetic field sensing. In this QUBITS seminar, Hans Stærkind will present the novel EXAAQ magnetometer – a compact, high-field optical quantum magnetometer designed for use in MRI environments. The talk will cover its underlying quantum technology and its potential to improve MR image quality by detecting subtle imperfections in magnetic field gradients.</p>
						
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														Monday 27  October 2025,
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														&nbsp;at 14:15 -  16:00
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													<p class="news-event__info__item__ical-link"><a href="/quantum/news-and-events/item/artikel/optical-magnetometry-for-mri-by-hans-staerkind?tx_news_pi1%5Bformat%5D=ical&amp;type=9819&amp;cHash=58d9a4993668317872453f19a0194cd2">Add to calendar</a></p>
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														<p>1532-122 Aud. G2</p>
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													Quantum Campus Aarhus (QCA)
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														<span itemprop="name">Lise Refstrup Linnebjerg Pedersen</span>
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                QUBITS format
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    <p>45-minute talk followed by refreshments and informal discussions.</p>


                    
                        



                    
                    
                        



                    
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    <p>In this talk <a href="https://nbi.ku.dk/ansatte?pure=da/persons/373407" target="_blank" rel="noreferrer">Hans Stærkind</a> (NBI, KU) will present the novel EXAAQ magnetometer. It is a high-field optical quantum magnetometer based on saturated absorption spectroscopy on the extreme angular-momentum states of the cesium D2 line. With key features including continuous readout, high sampling rate, and sensitivity and accuracy in the ppm range, it represents a competitive alternative to conventional techniques for measuring magnetic fields of several teslas.</p>
<p>The prototype has four small separate field probes, and all support electronics and optics are fitted into a single 19-inch rack to make it compact, mobile, and robust. The field probes are fiber coupled and made from nonmetallic components, allowing them to be easily and safely positioned inside a 7 T MRI scanner.</p>
<p>He will discuss how this system can be used for improving image quality in MRI, by detecting imperfections in the magnetic field gradients that are played out during an MR scanning sequence.</p>


                    
                        



                    
                    
                        



                    
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                    <p><a href="https://nbi.ku.dk/ansatte?pure=da/persons/373407" target="_blank" rel="noreferrer">Hans Stærkind</a> is a postdoctoral researcher at the Niels Bohr Institute, University of Copenhagen. His work focuses on quantum sensing and optical magnetometry, particularly in the context of biomedical imaging applications. He holds a PhD in physics and has contributed to the development of compact, high-performance magnetometers for integration with MRI systems.</p>
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