GE issues warnings about Omniscan

The following just came out over the SMRT mailing list:

Vendor issues new warning on Omniscan MR contrast for patients with kidney disease

GE Healthcare warned European providers Feb. 7 to discontinue the use of gadodiamide (Omniscan) for patients who may be at risk for a rare and life-threatening skin disease.

read the rest of the press release below the fold. Continue reading “GE issues warnings about Omniscan”

MRI-compatible pacemaker

via MedGadget,

Medtronic began the evaluation of its EnRhythm® MRI SureScan™ pacer, a technology designed for safe use in MRI machines, “under specified scanning conditions.” The company did not disclose what these specified scanning conditions are.

There’s a copy of the press release, too. I assume that certain kinds of scans are off-limits, like diffusion imaging. Eddy currents are probably the major concern. The press release does mention,

The EnRhythm MRI SureScan pacemaker includes modified hardware to minimize the level of energy transmitted through the lead/device connection point. The pacemaker also includes a new SureScan™ feature that can be programmed “on” before an MRI scan to eliminate the impact of MRI-generated electrical noise, which can prevent necessary pacing therapy or cause the device to oversense and deliver unnecessary pacing therapy. When the SureScan feature is on, the device’s data collection and monitoring functions are temporarily suspended, while allowing the device to continue providing asynchronous pacing if needed.

Imagine the future of this technology… what would be truly cool would be a pacemaker than can be interfaced to the scanner directly, so that pacing can be synchronized with the pulse sequence itself.

Superconductor breakthroughs imminent?

2007 may be a big year, at least according to industry spokespeople:

Low-cost MRI machines, super-fast Internet routers, and high-capacity power lines top the list of likely breakthroughs in the field of superconductivity in 2007, according to a ‘Top-10’ forecast list released today by Elie K. Track, Ph.D., senior partner, HYPRES Inc., a leading developer of superconducting microelectronics technology.

Dr. Track compiled the list of expected breakthroughs through comprehensive industry research, conversations with numerous scientific experts around the world, and through his work at HYPRES. The list was developed in an effort to pull together information on the wide variety of superconductivity projects worldwide and begin a dialog about the innovative advancements and breakthrough applications that are well positioned to occur next year.

“In my conversations with many respected colleagues, I continue to hear about new and exciting applications and breakthroughs that are likely to take place in 2007, largely because of the involvement of superconductor-based technologies,” said Dr. Track. “I thought it would be useful to pull all these together into one list so we can truly realize and appreciate the profound impact that superconductivity will have on various industries, the scientific community, and the average person in the coming year.”

Topping the list is an expected breakthrough announcement of laboratory demonstrations that can lead to an advanced, low-cost MRI machine that leverages superconducting technology.

It’s not clear to me how advances in supercon would lead to cheaper MRI machines. If room-temperature superconductors are developed, then design of MR machines can be simplified dramatically of course – no more cryo. But wouldn’t such new technology be expensive as well? I think it’s more likely that breakthroughs would lead to smaller MRI systems, ultimately even the fabled desktop unit. But cost savings aren’t going to come down the pike for years, even if high-temp supercon arrives tomorrow.

MRI of neonates

Philip Gordon, M.D. is a neonatologist whose blog, Tales from the Womb, occasionally touches on MRI-related topics. He has a recent post about the trouble with MRI in neonatology that is well worth reading. He takes issue with the emerging practice of attempting to use MRI to predict neuro-developmental outcomes in preterm infants, pointing to a paper in NEJM last year[1] as well as a more recent study at UNC Chapel Hill. He is highly skeptical:

Continue reading “MRI of neonates”

Lauterbur inducted into Inventor’s Hall of Fame

from the AP wire: Significant inventors honored Thursday on Capitol Hill

WASHINGTON (AP) — Inventors of the MRI, the Ethernet, the LP record and a popular weedkiller are among 18 people picked for induction into the National Inventors Hall of Fame.

The 2007 class of inductees was to be announced at an event Thursday on Capitol Hill. The honorees are joining luminaries such as Thomas Edison, Velcro inventor George de Mestral and Charles Goodyear, developer of vulcanized rubber.

“Some of these inventors … have literally changed the way we live our lives,” said Rini Paiva, spokeswoman for the National Inventors Hall of Fame Foundation. But, she added, “they are not household names.”

Among the latest inductees and their inventions are:

—Paul C. Lauterbur, for the MRI, or magnetic resonance imaging.

—Robert M. Metcalfe, for high-speed networking known as Ethernet.

—the late Peter C. Goldmark, for the long-playing record.

—John E. Franz, for the herbicide Roundup.

The Akron, Ohio-based hall was founded by the U.S. Patent and Trademark Office and the National Council of Intellectual Property Law Associations. It has inducted members since 1973 and will have honored 331 inventors with the new class.

The ceremony will be in May. More information will be at the National Inventor Hall of Fame website at http://www.invent.org.

NSFW MRI: Sex at 1.5T

That’s “not safe for work”, not “national science foundation” up there in the acronym. It was surely inevitable that this amazing, subtle and elegant technology would eventually be applied to more scatological pursuits. The following paper is a classic in this genre.

Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal.

OBJECTIVE: To find out whether taking images of the male and female genitals during coitus is feasible and to find out whether former and current ideas about the anatomy during sexual intercourse and during female sexual arousal are based on assumptions or on facts. DESIGN: Observational study. SETTING: University hospital in the Netherlands. METHODS: Magnetic resonance imaging was used to study the female sexual response and the male and female genitals during coitus. Thirteen experiments were performed with eight couples and three single women. RESULTS: The images obtained showed that during intercourse in the “missionary position” the penis has the shape of a boomerang and 1/3 of its length consists of the root of the penis. During female sexual arousal without intercourse the uterus was raised and the anterior vaginal wall lengthened. The size of the uterus did not increase during sexual arousal. CONCLUSION: Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy.

Schultz et al, BMJ. 1999 Dec 18-25;319(7225):1596-600. PMID 10600954.

Continue reading “NSFW MRI: Sex at 1.5T”