Bilobed chest flap.

R C Hamaker; D R Lowes

PubMed · 331632

Bilobed chest flap.

Abstract

The bilobed chest flap is presented as an additional method of reconstruction in head and neck surgery. The flap is a combination of two previously described flaps: the deltopectoral flap and the anterior-superior-oblique chest flap. It is based on four perforating vessels supporting an area of 480 to 560 sq cm. The superior and inferior lobes can be used simultaneously for external cervical coverage or in combination for external coverage and internal lining. The importance of this flap is appreciated in the patient who needs two deltopectoral flaps but who has had previous chest surgery on one side, or in one who requires two deltopectoral flaps with a planned fistula which then requires a third flap for closure.

Explore related subjects

Head Humans Neck Shoulder Skin Transplantation Surgery, Plastic Thoracic Surgery Thorax Transplantation, Autologous Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

R C Hamaker, D R Lowes. Bilobed chest flap.. https://pubmed.ncbi.nlm.nih.gov/331632/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2003

Optical tomography of a realistic neonatal head phantom.

We have begun clinical trials of optical tomography of the neonatal brain. To validate this research, we have built and imaged an anatomically realistic, tissue-equivalent neonatal head phantom that is hollow, allowing contrasting objects to be placed inside it. Images were reconstructed by use of two finite-element meshes, one generated from a computed tomography image of the phantom and the other spherical. The phantom was filled with a liquid of the same optical properties as the outer region, and two perturbations were placed inside. These were successfully imaged with good separation between the absorption and scatter coefficients. The phantom was then refilled with a liquid of increased absorption compared with the background to simulate the brain, and the absolute properties of the two regions were found. These were used as a priori information for the complete reconstruction. Both perturbations were visible, superimposed on the increased absorption of the central region. The head-shaped mesh performed slightly better than the spherical mesh, particularly when the absorption of the central region of the phantom was increased.

Head↗

PubMed2003

8.0-Tesla human MR system: temperature changes associated with radiofrequency-induced heating of a head phantom.

PURPOSE: To investigate if the heat induced in biological tissues by typical radio frequency (RF) energy associated with an 8.0-Tesla magnetic resonance (MR) system causes excessive temperature changes. MATERIALS AND METHODS: Fluoroptic thermometry was used to measure temperatures in multiple positions in a head phantom made of ground turkey breast. A series of experiments were conducted with measurements obtained at RF power levels ranging from a specific absorption rate (SAR) of up to 4.0 W/kg for 10 minutes. RESULTS: The highest temperature increases were up to 0.7 degrees C. An inhomogeneous heating pattern was observed. In general, the deep regions within the phantom registered higher temperature increases compared to the peripheral sites. CONCLUSION: The expectation of an inhomogeneous RF distribution in ultra high field systems (> 4 T) was confirmed. At a frequency of 340 MHz and in-tissue RF wave length of about 10 cm, the RF inhomogeneity was measured to create higher temperatures in deeper regions of a human head phantom compared to peripheral tissues. Our results agree with the computational electromagnetic calculations for such frequencies. Importantly, these experiments indicated that there were no regions of heating that exceeded the current FDA guidelines.

Head↗

PubMed2003

Reconstruction after rotational motion.

Patient rotational motion during a scan causes the k-space sampling to be both irregular and undersampled. Conventional regridding requires an estimate of the sampling density at each measured point and is not strictly consistent with sampling theory. Here, a 2D problem is converted to a series of 1D regriddings by exact interpolation along the measured readouts. Each 1D regridding, expressed in matrix form, requires a matrix inversion to gain an exact solution. Undersampled regions make the matrix ill-conditioned but summing the matrix columns (without inversion) indicates the undersampled regions. The missing data could be reacquired, but in this study it is estimated using a Delaunay triangle-based linear interpolation on the original 2D data. The matrix conditioning is improved, leading to images with reduced artifacts compared to other regridding schemes. Furthermore, there is no requirement to estimate a density compensation function at each of the measured points.

Head↗