Resources: Page 499

Cumulative CT doses reveal patients at risk from multiple scans
By Eric Barnes
Monday, November 30 | 3:50 p.m.-4:00 p.m. | SSE22-06 | Room S403BThe integration of CT into routine care is widely considered one of the most important advances in medicine; however, the frequent use of CT has substantially increased the population's cumulative exposure to ionizing radiation.
November 15, 2009
Korean CT dose survey finds scanner quality, education key to dose reduction
By Eric Barnes
Monday, November 30 | 3:30 p.m.-3:40 p.m. | SSE22-04 | Room S403BDr. Seung Eun Jung and colleagues from the Catholic University in Seoul sampled almost 13% of the country's CT scanners, directly measuring CT dose index on a phantom and recording scanning parameters at institutions for head, chest, and abdomen CT, calculating effective doses using automated software.
November 15, 2009
High-definition scanner offers sharper stent images
By Eric Barnes
Monday, November 30 | 11:40 a.m.-11:50 a.m. | SSC02-08 | Room S503ABDense stent materials and the resulting blooming artifacts on CT inhibit assessment of in-stent lumens. High-definition CT with high spatial resolution provided better accuracy of in-stent lumen sizes, according to research to be presented on Monday.
November 15, 2009
ASIR reconstruction boosts diagnostic power in HRCT of diffuse lung disease
By Eric Barnes
Monday, November 30 | 3:50 p.m.-4:00 p.m. | SSE06-06 | Room S404CDHigh-resolution CT (HRCT) with thin slices and high-spatial-frequency algorithms is the gold standard for evaluating diffuse lung disease. Most high-resolution CT scans are reconstructed using filtered back projection, but a new algorithm -- adaptive statistical iterative reconstruction (ASIR) -- may offer better image quality.
November 15, 2009
No problems after discharge for negative coronary CTA
By Eric Barnes
Monday, November 30 | 3:10 p.m.-3:20 p.m. | SSE03-02 | Room S502ABA negative coronary CT angiography (CTA) exam allows hospitals to send chest pain patients home and clear the backlog in the ER. But is it really safe? How do patients do over time? Researchers from the University of Washington School of Medicine in Seattle wanted to find out.
November 15, 2009
Experiment validates use of CT for in-stent stenosis assessment
By Eric Barnes
Monday, November 30 | 11:50 a.m.-12:00 p.m. | SSC02-09 | Room S503ABInvestigators from Brigham and Women's Hospital in Boston scanned a series of phantom coronary artery stenoses to validate CT assessment of coronary artery stenoses. They will discuss their results in this Monday scientific session presentation.
November 15, 2009
Lack of risk factors, D-dimer results rule out PE
By Eric Barnes
Monday, November 30 | 11:35 a.m.-11:45 a.m. | VC21-15 | Room S103CDWhile CT angiography (CTA) is the modality of choice for pulmonary embolism (PE), it is over-ordered, costly, and produces high radiation exposure. California researchers sought to determine the positivity rate of CTA, and whether thromboembolic risk factors can accurately indicate pretest PE probability.
November 15, 2009
High-pitch imaging cuts cardiac CT dose, improves image quality
By Eric Barnes
Tuesday, December 1 | 11:10 a.m.-11:20 a.m. | SSG18-05 | Room S403ABPhase-correlated imaging procedures represent the state of the art for cardiac CT angiography; however, the technique requires low pitch factors that increase the applied dose. In this study to be presented on Tuesday, researchers from Germany evaluated the potential benefits of high-pitch acquisition schemes.
November 15, 2009
Prospectively triggered CT angiography takes on patients with arrhythmias
By Eric Barnes
Monday, November 30 | 11:10 a.m.-11:20 a.m. | SSC01-05 | Room S502ABWhile prospective electrocardiogram (ECG)-triggering typically applies just a fraction of radiation exposure used in retrospective ECG gating, it also comes with two historical disadvantages -- solutions for which will be discussed in this scientific session presentation.
November 15, 2009
Dose-length product more accurate for measuring cardiac CT dose
By Eric Barnes
Monday, November 30 | 10:40 a.m.-10:50 a.m. | SSC02-02 | Room S503ABGlobal chest CT conversion factors, which are often used to calculate effective dose at cardiac CT, do not account for the variability of dose distribution with the procedure, according to radiation physicist Walter Huda, Ph.D., from the Medical University of South Carolina in Charleston.
November 15, 2009
Ultralow-dose 256-detector-row VC maintains sensitivity
By Eric Barnes
Sunday, November 29 | 12:05 p.m.-12:15 p.m. | SSA08-09 | Room E353AData indicate that virtual colonoscopy is safe, and the standard low radiation dose is not likely to be important in the ≥ 50-year-old population who may undergo the exam for screening. Nevertheless, using the lowest possible dose is desirable, and results from this study indicate image quality can be maintained with 256-detector-row VC while dose is reduced.
November 15, 2009
Contrast exposure in utero shows little effect on thyroid function
By Eric Barnes
Sunday, November 29 | 11:15 a.m.-11:25 a.m. | SSA09-04 | Room E351Citing concerns about the risk of thyroid dysfunction in newborns after they are exposed in utero to iodinated contrast media, researchers from Warren Alpert Medical School of Brown University in Providence, RI, tested contrast-exposed neonates for answers.
November 15, 2009
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