CT

Buffalo psychologist Jamie Shiffner, Ph.D., beat the odds. The acute stroke patient was lucky enough to have everything go right after being struck down. With ischemic stroke, time is brain. Within moments of Shiffner's collapse at home on the evening of April 11, 2005, millions of neurons in his brain began dying every minute. The left side of Shiffner's body went numb, and attempts to talk resulted in nonsense phrases.

The typical CT exam exposes patients to the equivalent of between 100 and 250 chest x-rays. This fact escapes most physicians, including radiologists, according to Dianna D. Cody, Ph.D., chief of radiologic physics at the University of Texas M.D. Anderson Cancer Center.

Volume Interactions launches 3D workstation at surgical meetingFDA clears wide-bore CT from GE Amicas licenses workflow managerPhilips partners to diagnose lung disease

Current 64-slice CT scanners with improved temporal resolution enable detection of subtle regional changes in good correlation with clinical reference standards, according to a study presented this month at the annual meeting of the Society for Computed Body Tomography and Magnetic Resonance.

Less than a week after going public with its intent to acquire Suros Surgical, Hologic announced the signing of a definitive agreement to acquire R2 Technology, the acknowledged pioneer of computer-aided detection. The stock swap is valued at $220 million. With the Suros deal (valued at $240 million) already on the table, Hologic now has about a half-billion dollars in transactions in the works.

Coronary CT angiography has clocked impressive numbers to detect or rule out coronary artery stenosis. But do these numbers hold up when uninterpretable data are factored into the results? The answer is yes and no, according to a study presented at the annual meeting this month of the Society of Computed Body Tomography and Magnetic Resonance.

The reconstruction of CT data lags far behind acquisition, creating a gulf that widens with each new generation of scanners. The problem is most pronounced on the leading edge of clinical use: cardiovascular, fluoroscopic, and interventional applications.

Revenue from the delivery of new CT units in the U.S. last year grew 15% compared with the previous year, and unit volume rose about 3%, making 2005 the best sales year in the history of the modality. The availability of 64-slice scanners capable of coronary CT angiography led the industry to those heights. This year, however, vendors are just hoping to hold onto last year’s gains.

Colonic diverticular disease does not necessarily spoil CT colonography, according to a study by University of Wisconsin researchers. There is a caveat, though: Radiologists must apply a 3D imaging approach.

Start-up to promote ventures in 64-slice CTCerner to work with medical school

PET/CT has a promising role in the diagnosis of diabetic foot infections, according to cumulative data by Dr. Zohar Keidar, deputy director of nuclear medicine at Rambam Medical Center in Haifa, Israel.

U.S. hospitals operate with SpineAssistDoD awards grant to develop advanced MR systemMedQuest appoints new chief financial officer

Congressional moves to cut Medicare payments for outpatient imaging procedures tops the list of what worries executives at Toshiba America Medical Systems. But reimbursement problems won’t stop the company from developing and promoting new imaging technologies.

A new three-phase contrast administration protocol that involves the simultaneous injection of contrast and saline during coronary CT angiography allows improved visualization of the right heart, according to researchers from the Medical University of South Carolina.

Vendors are off to a slow start this year in terms of FDA clearances, managing just 17 in February for a total of 38 for 2006. Only once in the last six years has the industry done worse: In 2004, FDA reviewers cleared just 35 devices in the first two months of the year.

Challenges remain for PET/CT in diagnosing lung cancer. Key among them is bolstering detection without increasing false positives. But in several studies presented at the 2005 RSNA meeting, researchers explored the quantitative data derived by the hybrid technique, and their findings could move PET/CT closer to practical use for this application.

The government plans to spend nearly $800,000 to determine the strategic importance of nuclear medicine research, according to National Institutes of Health chief Dr. Elias Zerhouni. Society of Nuclear Medicine president Dr. Peter Conti is encouraged about the initiative.

No development since I began covering medical imaging in late 1997 has generated the level of excitement and potential for change as the 64-slice CT scanner. Plenty has happened in those years: the flourishing of CAD and virtual colonoscopy, 3T MR and parallel processing, continued advancements in ultrasound, PET/CT and SPECT/CT fusion imaging, and the ascendancy of PACS and imaging informatics.

After installing a 64-slice CT system at Metroplex Hospital in Killeen, TX, radiologists invited asymptomatic referring physicians to undergo a free heart scan and experience the new technology firsthand. After a coronary CT angiogram, three of the doctors left with an appreciation for the new scanner- along with a diagnosis of heart disease.

Among European radiologists, concerns about ionizing radiation exposure give MR an edge in specific applications, including colorectal cancer screening in younger patient populations. But in the U.S., such concerns have not dampened enthusiasm for CT, particularly in neurovascular studies.

Imaging reconstruction software that “unfolds” the colon wall flat could greatly shorten reading time for CT colonography. Researchers from Argentina have found no significant differences in diagnostic accuracy between the “filet view” and conventional CTC in the first study comparing both virtual colonoscopy techniques.

New software from GE Healthcare can cut the average time needed to read a coronary CT angiogram to less than five minutes. Early use at Tennessee Heart and Vascular of the CardIQ Xpress, unveiled March 13 at the American College of Cardiology conference, resulted in physician reviews of 10 to 12 cardiac CTAs per hour.

Toshiba launches dual-panel system at ACC showAn angiography system that supports both cardiac and peripheral applications debuted March 11 in the Toshiba America Medical Systems booth during the American College of Cardiology meeting. Infinix DP-i/FD2, which incorporates two flat-panel detectors, meets ACC guidelines for both types of applications, according to the company. The system features an 8 x 8-inch floor-mounted cardiac C-arm and a 12 x 16-inch ceiling-mounted C-arm. The design allows coronary and vascular studies on the same table, increasing overall patient comfort and saving time that would otherwise be lost moving the patient to a second system.

The FDA was good to the radiology industry in 2005. For the third time in as many years -- and the fourth in the last five -- the regulatory agency cleared more than 300 radiological products. The last quarter could have been better, however.

State-of-the-art 64-slice CT is proving its worth as a potent noninvasive tool for imaging coronary arteries, but it has some noteworthy limitations, according to research presented at the ECR on Tuesday.

CT and MR angiography both provided more clinically useful information than duplex ultrasound in screening peripheral vascular disease. But when costs are factored in, CT emerged as the clear leader, according to a four-hospital study conducted in the Netherlands and described Saturday.

New computer-aided detection programs help less experienced readers find clinically significant polyps with CT colonography, but they prove less useful for experts, according to three studies presented at the ECR on Saturday.

MR colonography has yet to capture radiologists’ imagination to the same extent as CT. But the radiation-free exam has a bright future, especially if stool tagging techniques can avoid the need for bowel cleansing, according to speakers from the U.S. and Greece at ECR on Friday.

Nuclear cardiology has a new heavyweight contender, a gamma camera with a table capacity of 440 pounds, a gantry bore of 27.5 inches, and digital detectors that make the most of tough situations.

Who will speak for cardiac CT? Apparently, no one, when the setting is the annual business meeting of the Society for Cardiovascular Magnetic Resonance.