Tuesday, 29 May 2012

In-depth studies of hypercomplex medical realities

source
http://butdoesitfloat.com/In-depth-studies-of-hypercomplex-medical-realities

In-depth studies of hypercomplex medical realities

Related: Georg Parthen, Josef Schulz

Folkert

Saturday, 26 May 2012

Induced Electric Fields in Patients (MRI)

SOURCE

http://uon.technologypublisher.com/technology/8214


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Induced Electric Fields in Patients (MRI)

Description:

Controlled E-field gradient coils

Summary
A novel magnetic coil for MRI Scanners was developed by Sir Peter Mansfield and Prof. Roger Bowley at the University of Nottingham. The new gradient coil was designed to enable higher resolution in MRI scanners but at a reduced peripheral nerve stimulation in patients.

Key Benefits
    ·  The technology will enable the new high-field MRIs to conform to European regulations which limit workers’ acute exposure to strong electromagnetic fields.
    ·  The technology would enable high-field MRI systems to generate higher fields safely without compromising on performance.
    ·  The technology would both increase MRI resolution and reduce the side effects that the higher resolution would bring.
    ·  The new technology fits in with current designs and can be retrofitted to standard MRI machine design.

Gradient coil– 30 m of 6 x 3 mm 2 X-section per coil.
Markets Sectors
This technology addresses and caters for companies developing high-field magnetic system for high resolution imaging. High-field, high resolution systems are reported to represent the fastest growing segment; hospitals and clinics upgrade old equipment with state-of-the-art systems.
Patient comfort is a major factor in this market. The effect of high magnetic field on both workers and users is also a major concern. This is particularly important with the higher resolution machines. A European directive was passed to address this issue making it difficult to use the traditional style magnetic coil for high field applications in Europe. This technology will help gradient coil designers to use higher field for high resolution image, but also patient comfort.
Technical Information
Peripheral neural stimulation is a major problem in traditional gradient coil designs. Induced current problems in patients relate directly to gradient strength and modulation frequency. Current designs of gradient coil tend to limit ultra-high-speed imaging methods such as EPI (echo-planar imaging) as the induced currents would produce tingling sensations and involuntary muscle twitch. Neural stimulation could also trigger epileptic fits and/or cardiac fibrillation.
An important aspect for reduction of induced currents is the coil geometry. It is desirable to design the gradient coil in such a way as to prevent closed loop circulating currents within the body. Preliminary results using a four-sector gradient coil with rectangular geometry, operating in a low mutual coupling mode, indicate significant reduction in the E-field within the subject volume of the coil. Reduction in induced currents in the patient allows safer operation at higher magnetic field strengths together with faster scans currently prohibited through neural stimulation effects in standard coil geometries.
The magnetic gradient coil, which incorporates active acoustic control to give 40dB noise reduction over the object field, was used to produce a snap-shot image of a phantom in 10.6mS using EPI operation at 3.0 T as shown below.
IP StatusThis technology is currently protected by an international patent - published as WO 2003/038461.

Magnetic field bz produced by the gradient coil when the plates for the modified four-sector gradient coil are shorted and electric field between the plates is uniform across the plate diameter.

Three-dimensional plot of the spatial distribution of the induction field for the coil arrangement.

Title

(EN) MRI GRADIENT COILS WITH REDUCED NEURAL STIMULATION

Abstract:

(EN) A novel approach to the design of gradient coils for MRI is introduced which takes into account from the start the effects of induced E-fields and hence currents in a patient subjected to time dependent magnetic field gradients. The approach has led to conceptually novel designs of gradient coils which comprise distributions of electrodes or tessellae placed around the basic coil structure. When properly energised the electrode arrays are able, in the simplest case, to reduce the maximum E-field experienced by the patient by approximately a factor of three over that experienced with a standard fingerprint or distributed transverse gradient coil, the comparison being done for the same gradient strength, same coil diameter and same ROI.

Direct Link:

http://uon.technologypublisher.com/technology/8214

Category(s):

For Information, Contact:

A Yinka Ogunjimi

Licensing Executive - Physical Sciences

The University of Nottingham

0115 82 32189

bbaao@exmail.nottingham.ac.uk

Inventors:

Keywords:

CT Scan Room

SOURCE

http://epcon-inc.com/project.php

Design Build Toshiba Aquilion CT Scan Room – William Beaumont Army Medical Center <- (click to view images)
Completion: September 2008
Owner: William Beaumont Army Medical Center/Toshiba America Medical Systems
Contact: Gabriel Pena (WBAMC)/David Painter (Toshiba)
Architect/Engineer: Lopez Architects
Description: Architectural and MEP modifications of existing CT Scan space to allow functional installation of a new Toshiba Aquilion CT Scan.

Design Build Philips X-Ray Room - William Beaumont Army Medical Center <- (click to view images)
Completion: June 2004
Owner: William Beaumont Army Medical Center/Philips
Contact: Gabriel Pena (WBAMC)
Architect/Engineer: Lopez Architects
Description: Architectural and MEP modifications of existing X-ray space to allow functional installation of a new Philips Radiographic and Fluoroscopic System.

Curatorial Storage and Research Building – Big Bend National Park <- (click to view images)
Completion: March 2008
Owner: National Park Service/Big Bend National Park
Contact: Ken Franc (NPS Denver)
Architect/Engineer: National Park Service
Description: An approximately 7,000-SF building housing a curatorial storage and research facilities.

Restroom Renovation and Visitor Center Expansion – Big Bend National Park <- (click to view images)
Completion: March 2008
Owner: National Park Service/Big Bend National Park
Contact: Charles Vickrey (NPS Santa Fe)
Architect/Engineer: National Park Service
Description: A 2000-SF renovation and addition to the visitor center consisting of rehabilitation of the public restroom and existing visitor center including a 1,116-SF expansion to house a new book store.

Theater Remodeling – Chamizal National Memorial Park <- (click to view images)
Completion: March 2002
Owner: National Park Service/Big Bend National Park
Contact: Tammy Gallegos (NPS Santa Fe)
Architect/Engineer: National Park Service
Description: Rehabilitation of the public restroom, theater stage and replacement of theater seat.

Cloudview Parking Lot – Coronado High School <- (click to view images)
Completion: June 2006
Owner: El Paso Independent School District
Architect/Engineer: Martinez Engineering Group
Description: A new parking lot addition to Coronado High School.

Jefferson High School Running Track<- (click to view images)
Completion: May 2004
Owner: El Paso Independent School District
Architect/Engineer: CEA Engineering Group
Description: Demolition of existing running track and construction of new running track to meet Olympic standard dimensions including the installation of football light reflectors and the creation of new pond area for drainage purposes.

Fluoroscopy

SOURCE

http://www.radiology-equipment.com/detail.CFM?LineItemID=1466

Used Fluoroscopy Equipment For Sale. Refurbished, Pre-Owned & Reconditioned Fluoroscopy Equipment at Reasonable Prices. Used and Refurbished Radiology Equipment and X-Ray Equipment, Used and Refurbished Diagnostic Imaging Equipment, Used Cath Labs, Used C-Arms, Used MRI Systems, Used CT Scanners, Used PET Scanners, Used Nuclear Medicine Equipment, Used Mammography Equipment, Used Fluroscopy Equipment and Used Cardiology Equipment.

FOR SALE:

DEPARTMENT:

Siemens AXIOM Luminos TF - Universal Fluoroscopy - Wanted to Buy

Category:	Fluroscopy Equipment	Item:	Universal Fluoroscopy
Manufacturer:	Siemens	Model:	AXIOM Luminos TF
Status:	Wanted	Price:	Contact Us - Click Here To SELL Your Item!
Item ID:	1466	Year:	Unknown
Description:	AXIOM Luminos TF Versatile fluoroscopy solution weight limit up to 600 lbsAXIOM Luminos TF is a top-of-the-line fluoroscopy system designed for the complete spectrum of patient profiles – from pediatrics to bariatrics. With its highly robust, fully automatic table and open architectural design, the system easily supports full dynamic table movements even during examinations on patients weighing up to 500 lbs (230 kg). And for patients weighing up to 600 lbs, the system allows examinations in the locked static table position. AXIOM Luminos TF offers remarkably convenient and efficient system handling with the new tableside user interface and comprehensive dose-reduction features. Combined with the mobile Flat Detector (mFD), the AXIOM Luminos TF provides the ability to expand to a full digital radiographic service. System Highlights: Full dynamic movement during fluoroscopy examinations on patients weighing up to 500 lbs (230 kg) and up to 600 lbs in static table position Full tilt function and 4-way tabletop movements Flexible and ergonomic handling through Opti Grip and Opti Touch Display Ambidextrous and ergonomic tableside user interface Powerful and robust X-ray tube Up to 500 Ibs for dynamic and 600 Ibs for static system operation **optional

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