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Monday, February 04, 2013

GE Silent Scan MRI


GE Healthcare has introduced a new data acquisition technology designed to improve patient comfort by largely eliminating the horrible noise generated during an MRI scan. Conventional MRI scanners can generate noise levels in excess of 110 dBA (creating a din that sounds like a cross between a vehicle's reverse warning horn and a Star Trek phaser) but GE says its new Silent Scan MRI technology can reduce this to just above background noise levels in the exam room.
The noise that MRI scanners produce is related to changes in the magnetic field that allow the slice by slice body scan to be carried out. In recent years, industry efforts to speed up the scanning process have also resulted in louder and louder scans. The designers have attempted to dampen these noises with mufflers and baffles, achieving only limited success.
Silent Scan is achieved through two new developments. First, acoustic noise is essentially eliminated by using a new 3D scanning and reconstruction technique called Silenz. When the Silenz protocol is used in combination with GE's new high-fidelity MRI gradient and RF system electronics, the MRI scanning noise is largely eliminated at its source.
At the 2012 meeting of the Radiological Society of North America, an MRI system compatible with the Silent Scan technology was linked into a soundproof room. When the MRI system used conventional scanning methods, a staccato, stuttering racket with noise peaks up to 110 dBA was heard. However, when Silent Scan was switched on, the noise level dropped to 76 dBA, just above the background noise of the MRI electronics. This is accomplished without substantial trade-offs in scanning time or image quality, according to Richard Hausmann, president and CEO, GE Healthcare MR. The comparison is shown in this video.
Silent Scan technology has not yet obtained 510k Premarketing Notification clearance from the FDA, so it's not yet available for sale. GE is presumably hoping for a decision that Silent Scan is "substantially equivalent" to existing MRI scanners, a result that would greatly simplify the new technology's entry into the diagnostic market.
Source: GE Healthcare

Friday, February 01, 2013

Salter-Harris classification of Fractures SALTR

SALTR - a useful mnemonic to help remember the five types of growth plate fracture (Salter-Harris classification). Fortunately the order also directly relates to prognosis from best to worse.
S - slipped = type I
A - above = type II
L - lower = type III
T - through or transverse or together = type IV
R - ruined or rammed = type V


SALTR - a useful mnemonic to help remember the five types of growth plate fracture (Salter-Harris classification). Fortunately the order also directly relates to prognosis from best to worse.
  • S - slipped = type I
  • A - above = type II
  • L - lower = type III
  • T - through or transverse or together = type IV
  • R - ruined or rammed = type V
Source: radiopaedia.org







Medtronic Introduces the 1st and Only Neurostimulation Systems with CE Mark Approval for Full-Body MRI Scans


Medtronic Introduces the 1st and Only Neurostimulation Systems with CE Mark Approval for Full-Body MRI Scans


Medtronic, Inc. (NYSE: MDT) today introduced in Europe the first and only implantable neurostimulation systems indicated for use in the treatment of chronic back and/or leg pain that are designed for full-body Magnetic Resonance Imaging (MRI) scans under specific conditions.
The first new system implants have been performed by Dr. JP Van Buyten and Dr. Iris Smet in Belgium; Dr. Rasche and Professor Tronnier in Germany; Dr. J. De Andres in Spain; Dr . K. Gatzinsky in Sweden, and Professor Buchser in Switzerland.


Medtronic neurostimulation systems for the treatment of chronic pain recently received ConformitĂ© EuropĂ©enne (CE) Mark approval for compatibility with full-body MRI scans. Neurostimulation systems enhanced with this technology and using VectrisTM SureScan® MRI leads include: RestoreSensor® SureScan® MRI, PrimeAdvanced® SureScan MRI, RestoreAdvanced® SureScan MRI, and RestoreUltra® SureScan MRI. Medtronic SureScan neurostimulation systems for the treatment of chronic pain are not approved by the U.S. Food and Drug Administration for use in the United States.
“Neurostimulation therapy has become a mainstay of chronic pain management, and the introduction of full-body, MRI-compatible spinal cord stimulation systems is an important advancement that will help ensure neurostimulation patients have access to the diagnostic tools needed to quickly identify potentially critical health conditions,” said Dr. JP Van Buyten from the AZ Niklaas Hospital in Belgium.
MRI scans allow physicians to make a wide range of health diagnoses by viewing highly detailed images of internal organs, blood vessels, muscle, joints, tumors, areas of infection and more. MRI utilizes strong magnetic fields and radio frequency pulses to create images of structures inside the body.
As advancements in technology have increased MRI accuracy, effectiveness and patient comfort, MRI use has increased dramatically in recent years. It is estimated that 60 million MRI procedures are performed worldwide each year.1 In Western Europe alone, 29 million scans were performed in 2010, with the number of scans doubling every five years.2
Medtronic SureScan neurostimulation systems address a significant medical need for full-body MRI compatibility by enabling patients who are receiving Medtronic neurostimulation therapy for chronic back and/or leg pain (also called spinal cord stimulation, or SCS) to have access to the benefits of full-body MRI. Until now, SCS patients were denied full-body MRI scans because of fears of the system being affected by the large magnets involved in MRI.
“Delivering systems that are compatible with a full-body MRI scan means that spinal cord stimulation patients will not have to compromise when it comes to their healthcare, and they can feel secure knowing that MRI is a diagnostic option,” said Julie Foster, general manager and vice president, Pain Stimulation and Targeted Drug Delivery in the Neuromodulation business of Medtronic, Inc. “Medtronic’s development of these systems is another example of our commitment to advancing increasingly innovative and cost effective solutions that make it easier for clinicians to safely, effectively and efficiently diagnose and treat the patients they serve.”
Medtronic SureScan neurostimulation systems include enhancements to existing devices as well as specially designed leads to reduce or eliminate the hazards produced by the MRI environment. The devices also include a proprietary SureScan programming feature, which sets the device into an appropriate mode for the MRIenvironment.
These systems are the latest additions to a growing number of Medtronic devices which are safe for MRI access to any region of the body when used according to specified MR Conditions for Use, including the Medtronic SynchroMed® II programmable drug infusion system and the Advisa DR MRI™ SureScan® pacing system available outside the U.S. In the U.S , such devices include the Medtronic SynchroMed® II programmable drug infusion system and the Revo MRI® SureScan® pacing system which are safe for MRI access to any region of the body when positioning guidelines are followed.
Source: Medtronic

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MRI Nueroarm Video