Using nuclear medicine techniques, physiologic activity and processes can be identified in a way that is unique from other modalities. Oftentimes it is helpful to know the exact location of the physiologic uptake that is visualized on a scan. Knowing the exact location can sometimes help to distinguish normal from abnormal physiologic uptake. When an… (More)
Current magnetic resonance (MR) imaging systems use four basic types of magnets: permanent, resistive (electromagnets), hybrid (combines principles of permanent and resistive magnets), and superconducting (resistive-like magnets cooled to near absolute zero to achieve superconductivity). The first three have relatively low field strength (0.2-0.6 T)… (More)
We assessed the incidence, clinical significance and etiology of ventricular dysfunction after intraatrial repair of d-transposition of the great arteries in 11 patients, mean age 9 +/- 3 years, who had had Mustard operations. We compared the results to 15 patients who were considered to have normal ventricular function, two patients who had Rastelli… (More)
To facilitate the proper interpretation of MR images, it is necessary for the radiologist to be alert to the many potential sources of image artifacts.
The signal-to-noise response characteristics for two surface coils of different construction geometries (a single-turn planar coil and a single-turn saddle-shaped coil) were measured and compared with head and body coils. Measurements were made at different gradient magnifications (0, 20, 30, and 40%, relative to the head coil) and with different numbers of… (More)
Opinion surveys were gathered before and 6 months after installation of a prototype picture archiving and communication system (PACS) (PACS/1, Siemens Medical Systems, Iselin, NJ). Median turnaround times and the percent of delayed or missing reports were calculated for 1,026 baseline and 8,438 follow-up studies at 6 months. Neuroradiological (neuro)… (More)
We compared liver scan interpretations based on anterior images obtained in the upright, prone, and supine positions. Receiver-operating-characteristic curves were generated for three well trained observers. Results showed that reading the three different views together was more accurate than the reading of any individual image. Furthermore, interpretations… (More)