Seated vs. supine: consideration of the optimum measurement posture for brain-dedicated PET.

08:00 EDT 16th May 2019 | BioPortfolio

Summary of "Seated vs. supine: consideration of the optimum measurement posture for brain-dedicated PET."

Some recently developed brain-dedicated positron emission tomography (PET) scanners measure subjects in a sitting position. Sitting enables PET scanning under more natural conditions for the subjects and also helps with making the scanners smaller. It is unclear, however, how much the degree of head motion when sitting differs from the supine posture commonly employed in clinical PET. In this report, we describe development of a markerless and contactless head motion tracking system and a study of healthy volunteers in several different postures to determine the optimum posture for brain PET. We used Kinect® (Microsoft) and developed software that can measure head motion with about 1-mm (translation) and less than 1-deg (rotation) accuracy. In the volunteer study, we measured the amount of head motion, with and without head fixation, in supine, normal sitting, and reclining postures. The results indicated that the normal sitting posture without head fixation had the largest head movement, and that the reclining and supine postures were similarly effective for minimizing head movement (average head movement of about 0.5 mm during 1 min). We also visualized the influence that head motion had on images for each pose by simulating the actual motions obtained from the volunteer study using a digital Hoffman phantom. Comparisons with the original image showed that the extent to which motion was reduced in the reclining and supine postures were quantitatively equivalent. The head motions of the volunteer studies were also reproduced using a mannequin head on a motorized stage to assess how well the proposed motion measurement system worked when used for motion correction. The results indicated that even though the system improved image quality for all postures, the reclining and supine postures could provide better image quality than the normal sitting posture.


Journal Details

This article was published in the following journal.

Name: Physics in medicine and biology
ISSN: 1361-6560


DeepDyve research library

PubMed Articles [11899 Associated PubMed Articles listed on BioPortfolio]

The influence of posture on parasternal intercostal muscle activity in healthy young adults.

Parasternal intercostal muscle electromyography (EMGpara) has been used as an index of respiratory load in health and disease. While reference values are available, such data have been obtained with s...

Effects of posture on electric fields of non-invasive brain stimulation.

The brain moves when the orientation of the head changes. This inter-postural motion has been shown to affect the distribution of cerebrospinal fluid (CSF). As CSF layer thickness affects the distribu...

In vivo measurements of collapse behavior of human internal jugular vein during head-up tilt tests.

Human internal jugular veins (IJVs) would collapse during posture change from supine to erect, which might influence intracranial hemodynamic. This study aimed to quantitatively describe the gradual c...

Validation of a wrist-type home nocturnal blood pressure monitor in the sitting and supine position according to the ANSI/AAMI/ISO81060-2:2013 guidelines: Omron HEM-9600T.

The purpose of the present study was to evaluate the performance of the Omron HEM-9600T, an automatic wrist-type device for self BP measurement, in the sitting position with the wrist at heart level a...

Differences in body positional bilateral symmetry between stance and supine positions, and the impact of attention and awareness on postural symmetry.

Postural asymmetries may cause structural pathological conditions and impaired movement pattern. The influence of body position and awareness towards symmetry has not yet been elucidated. The aim of t...

Clinical Trials [7328 Associated Clinical Trials listed on BioPortfolio]

Gentle Jogger and Oxygen Consumption

This is a non randomized study to determine the effects of Gentle Jogger(GJ), a passive jogging device on oxygen consumption in 2 postures supine and seated. Oxygen consumption measurement...

Evaluation of the Physiopathological Phenomena and the Haemodynamic and Cerebral Metabolic Effects From Semi-seated Position to Lying Position in Patients With Brain Trauma

Brain trauma is an important burden in traumatologic intensive care. In these patients the treatment is guided by a cluster of multimodal monitoring parameters. Despite this it is difficul...

Aqueous Outflow Facility Changes With Posture

Intraocular pressure (IOP) varies with body position, with a significant increase occurring from the seated to the supine position. Previous research has indicated that the IOP increase ca...

Validation of a Correction Factor for Measurement of an Accurate Ankle-Brachial Index in the Seated Position

The purpose of this study is to test a correction factor which would allow ankle brachial indexes taken in the seated position to accurately predict an ankle brachial index taken in the su...

Evaluating the Effectiveness of Posture Correction Girdle for Adolescents With Early Scoliosis

Through the ITF-Tier 3 project (ITS/ 237/ 11), a prototype of the posture correction girdle based on the clinical, textile science, material and ergonomics engineering analyses has been de...

Medical and Biotech [MESH] Definitions

The posture of an individual lying face up.

The measurement of magnetic fields over the head generated by electric currents in the brain. As in any electrical conductor, electric fields in the brain are accompanied by orthogonal magnetic fields. The measurement of these fields provides information about the localization of brain activity which is complementary to that provided by ELECTROENCEPHALOGRAPHY. Magnetoencephalography may be used alone or together with electroencephalography, for measurement of spontaneous or evoked activity, and for research or clinical purposes.

A numerical rating scale for classifying the periodontal status of a person or population with a single figure which takes into consideration prevalence as well as severity of the condition. It is based upon probe measurement of periodontal pockets and on gingival tissue status.

The anterior concavity in the curvature of the lumbar and cervical spine as viewed from the side. The term usually refers to abnormally increased curvature (hollow back, saddle back, swayback). It does not include lordosis as normal mating posture in certain animals ( = POSTURE + SEX BEHAVIOR, ANIMAL).

The height of the ABDOMEN as measured in the SUPINE POSITION.

Quick Search


DeepDyve research library

Searches Linking to this Article