Publications by authors named "M Helen Grant"

2,308 Publications

  • Page 1 of 1

Rotation sensitivity and shot-noise-limited detection in an exceptional-point coupled-ring gyroscope.

Opt Lett 2021 Jun;46(12):2936-2939

A theoretical study is performed of the sensitivity and quantum-noise limit of a passive coupled-ring optical gyroscope operated at and detuned from its exceptional point (EP) and interrogated with a practical conventional readout system. When tuned to its EP, the Sagnac frequency splitting is proportional to the square root of the applied rotation rate, but the signal generated by the sensor is shown to be proportional to the applied rotation rate. The sensitivity is never larger, and the minimum detectable rotation rate in the quantum-noise limit never lower, than that of a standard single-ring gyro of the same radius and loss, even when the coupled-ring gyro is tuned exactly to its EP. As pointed out elsewhere for other EP sensors, in this particular passive sensor at least, there is no sensitivity or resolution benefit in operating at an EP.
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http://dx.doi.org/10.1364/OL.423700DOI Listing
June 2021

Children and young people's experiences of having a sibling with complex health needs: a literature review.

Nurs Child Young People 2021 Jun 14. Epub 2021 Jun 14.

School of Nursing and Midwifery, Faculty of Medicine, Health and Life Sciences, Queen's University Belfast, Belfast, Northern Ireland.

Children with complex health needs require significant healthcare input for one or more conditions. Much of the literature on the effects of living with children with complex heath needs focuses on parents, and there is little research into the effects on siblings. This article reports on a literature review that examined the experiences of siblings growing up with a brother or sister with complex health needs and how this affects their lives. Three main themes were identified: emotional experiences; coping strategies and support; and family life. The findings identified in relation to mixed emotions, coping strategies and support systems are similar to those of studies of siblings of autistic children and children with cancer. However, in most countries the provision and availability of support for this group of siblings is inadequate.
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http://dx.doi.org/10.7748/ncyp.2021.e1326DOI Listing
June 2021

Selecting Elements for a Cardiac Enhanced Recovery Protocol.

J Cardiothorac Vasc Anesth 2021 May 11. Epub 2021 May 11.

University of Massachusetts-Baystate, Heart, Vascular and Critical Care Units, Baystate Medical Center, Springfield, MA.

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http://dx.doi.org/10.1053/j.jvca.2021.05.006DOI Listing
May 2021

Transthoracic Echocardiography: Beginner's Guide with Emphasis on Blind Spots as Identified with CT and MRI.

Radiographics 2021 Jun 11:200142. Epub 2021 Jun 11.

From the Departments of Radiology (M.D.G., R.D.M., S.D.K., R.M.B., J.D.M., D.W.G., E.A.R.) and Cardiology (J.M.R.), Madigan Army Medical Center, 9040 Jackson Ave, Tacoma, WA 98431; and the Uniformed Services University of the Health Sciences, Bethesda, Md (M.D.G., J.M.R., D.W.G., E.A.R.).

Transthoracic echocardiography (TTE) is the primary initial imaging modality in cardiac imaging. Advantages include portability, safety, availability, and ability to assess the morphology and physiology of the heart in a noninvasive manner. Because of this, many patients who undergo advanced imaging with CT or MRI will have undergone prior TTE, particularly when cardiac CT angiography or cardiac MRI is performed. In the modern era, the increasing interconnectivity of picture archiving and communication systems (PACS) has made these images more available for comparison. Therefore, radiologists who interpret chest imaging studies should have a basic understanding of TTE, including its strengths and limitations, to make accurate comparisons and assist in rendering a diagnosis or avoiding a misdiagnosis. The authors present the standard TTE views along with multiplanar reformatted CT images for correlation. This is followed by examples of limitations of TTE, focusing on potential blind spots, which have been placed in seven categories on the basis of the structures involved: pericardium (thickening, calcification, effusions, cysts, masses), aorta (dissection, intramural hematoma, penetrating atherosclerotic ulcer), left ventricular apex (infarcts, aneurysms, thrombus, apical hypertrophic cardiomyopathy), cardiac valves (complications of native and prosthetic valves), left atrial appendage (thrombus), coronary arteries (origins, calcifications, fistulas, aneurysms), and extracardiac structures (primary and metastatic masses). RSNA, 2021.
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http://dx.doi.org/10.1148/rg.2021200142DOI Listing
June 2021

Neuroma of The Supraorbital Nerve Following Forehead Flap Reconstruction - Presentation and Surgical Management.

J Craniofac Surg 2021 Jun;32(4):1515-1516

Department of Plastic and Reconstructive Surgery.

Abstract: Localized pain or headache from neuroma formation is a rare and challenging complication of forehead flap surgery. Here the authors present a patient who developed local pain and dysesthesia following iatrogenic injury to the left supraorbital nerve during forehead flap elevation. Following a diagnostic nerve block in clinic, surgical excision of the neuroma was performed through an upper blepharoplasty approach. The patient had immediate postoperative pain relief and remains pain free at fifteen-month follow-up. The authors describe etiology, workup, and surgical management of sensory nerve injury during forehead flap reconstruction.
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http://dx.doi.org/10.1097/SCS.0000000000007566DOI Listing
June 2021