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At least 757 records · Page 42Linked to original sources
PubMed2005

Multimodality imaging of borderline left main coronary disease using fluoroscopy, IVUS and CT coronary angiography.

A borderline left main narrowing was discovered during coronary angiography in a young asymptomatic man with positive stress test. IVUS demonstrated minimal diameter of 2.9 mm and the cross-sectional area was 11.5 mm(2). CTs were performed, and an eccentric calcific plaque was imaged at the ostium of the left main. Based on all three image modalities after discussing the different therapeutic options with the patient he was referred for bypass surgery.

Coronary Angiography↗
PubMed1993

A real time dual-energy probe for tissue characterization during fluoroscopy.

In the past dual-energy techniques have been applied with a variety of detector systems. However, making clinical decisions during a diagnostic x-ray procedure by using dual-energy information has not been possible. This paper looks at the development of a dual-energy probe that permits real time analysis. The technique is based on the local analysis procedure introduced by Speller and co-workers and uses spectral filtering for energy separation. The split-detector probe is optimized using computer models, and the effects of beam hardening and scattered radiation are considered. It is shown that a 0.25 mm CsI/25 mm NaI combination of detector elements with a 0.3 mm Cu filter offers the best performance. Preliminary results using the probe for in vivo analysis of gall stone composition compare well with the more accepted methods of x-ray diffraction and atomic absorption spectroscopy. The two groups of stones evaluated were found to have mean effective atomic numbers of 5.6 +/- 1.7 and 9.6 +/- 0.5. It is suggested that such a procedure could prove useful in patient management in the use of lithotripsy.

Absorptiometry, Photon↗
PubMed1997

Synchronous recording and review of oesophageal manometry and video fluoroscopy using a portable manometry recorder and PC with integrated digital video acquisition.

We present the technical details of a new system for the synchronous recording and review of a combined oesophageal manometry and video fluoroscopic barium swallow examination. The system developed uses a portable manometry recorder and personal computer (PC) with an integrated digital video acquisition system. These are controlled using software to enable the real time capture of digital video and manometric data throughout the combined examination. The recorded pressure waveforms can then be synchronously displayed on a screen with the recorded digital video of the fluoroscopic barium swallow. This new tool enables both comparative measurement and detailed analysis of the relationship between visualized bolus transport and pressure measurements. It provides for a deeper understanding and improved clinical assessment of complex motility disorders over those obtained when these two modalities are applied separately. The system is easily incorporated into a clinical radiology suite and it is both user and patient friendly. It uses readily available computer hardware together with multimedia software and is a comparatively economical addition to the radiology suite with the manometry analysis available fulfilling the criteria laid down by the Clinical Associates Group of the British Society of Gastroenterology.

Esophageal Motility Disorders↗
PubMed1997

Radiation exposure to the orthopaedic surgical team during fluoroscopy: "how far away is far enough?".

OBJECTIVES: To correlate the amount of radiation exposure to members of the orthopaedic surgical team based on their relative positions during a simulated fluoroscopically assisted orthopaedic procedure. DESIGN: Experimental study using commercially available fluoroscopic units and dosimetry badges designed to measure "eye" (ocular lens), "shallow" (hands/skin), and "deep" (whole-body) radiation exposure. SETTING: Standard hospital operating room at a level one trauma center. PARTICIPANTS: Dosimetry badge clusters at specified distances from a fluoroscopic x-ray beam. Represented positions were direct beam contact, surgeon (12 in/30.5 cm), first assistant (24 in/70 cm), scrub nurse (36 in/91.4 cm), and anesthesiologist (60 in/152.4 cm). INTERVENTION: Dosimetry badges were systematically exposed by a protocol intended to maximize radiation scatter. A maximum time for continuous fluoroscope use was set at ten minutes. MAIN OUTCOME MEASUREMENTS: Radiation exposure readings from dosimetry badges processed by a commercially available dosimetry service. RESULTS: Maximum readings are reported. Direct beam contact resulted in approximately 4000 mrem/minute (40 mSv/min) of radiation exposure. Deep exposure for the surgeon and first assistant was 20 mrem/min (0.2 mSv/min) and 6 mrem/min (0.06 mSv/min), respectively. Superficial exposure was 29 mrem/min (0.29 mSv/min) for the surgeon and 10 mrem/min (0.1 mSv/min) for the first assistant. Eye exposure was 10 mrem/min (0.1 mSv/min) for the surgeon and 6 mrem/min (0.06 mSv/min) for the first assistant. At the scrub nurse position, no deep or eye exposure was detected. One positive badge for shallow exposure was noted at the scrub nurse position, reflecting a 2 mrem/min (0.02 mSv/min) exposure rate. After ten minutes of continuous exposure, badges assigned to the anesthesiologist position never registered any positive readings. CONCLUSIONS: These results indicate that unprotected individuals working twenty-four inches (70 cm) or less from a fluoroscopic beam receive significant amounts of radiation, whereas those working thirty-six inches (91.4 cm) or greater from the beam receive an extremely low amount of radiation.

Air Pollution, Radioactive↗
PubMed2005

Inadvertent intraforaminal iliosacral screw placement despite apparent appropriate positioning on intraoperative fluoroscopy.

We present the case of an intraforaminal iliosacral screw placed percutaneously with aid of C-arm using inlet, outlet, and lateral views of the pelvis. The iliosacral screw was placed above the S1 foramen on the outlet view, into the middle of S1 via the ala on the inlet view, and below the cortical shadow of the ala on the lateral view. The patient was neurologically intact postoperatively, but began to complain of severe radicular pain in the S1 distribution down to the foot within 1 week postsurgery. There was mild weakness of plantar flexion. Postoperative computed tomography scan showed that the iliosacral screw was within the S1 foramen. Because of the tangential nature of the S1 foramen, slight posterior placement of the screw into the S1 body and not into the promontory resulted in violation of the foramen despite it being above the cortical shadow on the outlet view.

Adolescent↗
PubMed1992

Oral fluorescein angiography and fluoroscopy: determination of plasma fluorescein levels and clinical application.

One hundred oral fluorescein angiographic explorations were performed in 85 patients of both sexes, mean age 55.57 years, and range 8 to 77 years. Fluorescein was administered as one 250-mg (15 patients) or 500-mg (70 patients) capsule per 15 kg of body weight. In 15 fasting and 15 postprandial patients administered 500-mg capsules, no significant differences by group were found between fluorescein plasma levels. Fundus fluorescence under slitlamp illumination was poor for patients receiving the lower dosage of fluorescein, whereas at the higher dosage it was visible in all but one patient. The best filters were found to be a Kodak-Wratten 47A for the excitation filter and Kodak-Wratten 8 for the barrier filter. With a conventional fundus camera and fluorescein angiography filters, good photographs were achieved in all cases. The integrity of the blood-retina barriers was explored for various chorioretinal pathologies.

Administration, Oral↗