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At least 289 records · Page 16Linked to original sources
PubMed1986

Right ventricular ejection fraction: comparison of technetium-99m first pass technique and ECG-gated steady state krypton-81m angiocardiography.

Right ventricular ejection fraction (RVEF) calculated from ECG-gated steady-state 81mKr angiocardiography and from 99mTc first-pass studies were compared in 30 patients using a digital, single crystal, gamma-camera. Despite the two entirely different approaches RVEF values obtained by the two methods were comparable (r = 0.97): the mean absolute difference between the two techniques was 2.5% +/- 1.5% and the largest observed absolute difference was 5%. In the absence of an accepted reference method for measuring RVEF, this close correlation provides indirect validation of both techniques. The choice of method will therefore depend on several factors, including radiotracer availability, the characteristics of the gamma-camera and the protocol of clinical investigation.

Adult↗
PubMed1985

Dry aerosol of monodisperse millimicrospheres for ventilation imaging: production, delivery system, and clinical results in comparison with 81m-krypton and 127-xenon.

The production of monodisperse human albumin millimicrospheres (diameter less than 1 micron) and labeling with 99mTc is described. A system constructed to nebulize and deliver a dry aerosol yielded a lung delivery efficiency of approximately 25%. In 48 patients without and with varying degrees of chronic obstructive lung disease, quantitative comparison with 81mKr (penetration index, regional distribution of activity in the lungs) demonstrated similar penetration of the particles to the lung periphery (r = 0.89 and r = 0.94, respectively). Qualitative comparison with 81mKr or 127Xe showed complete or a high degree of diagnostic agreement in all but one patient. Semiquantitative scoring of hot spots as a substrate of local turbulent airflow showed a close inverse correlation (r = -0.82) with the forced expiratory volume in 1 s (FEV 1.0%), thus providing additional information about the severity of the airway obstruction. In 24 patients with suspected pulmonary embolism, complete agreement between aerosol and 81mKr images was found in all patients studied. For same-day ventilation/perfusion studies, labeling of the millimicrospheres with 111In yielded images of comparable quality to those obtained with the 99mTc-labeled aerosol.

Aerosols↗
PubMed1990

The effect of krypton ions on Artemia cysts.

Dry eggs of Artemia salina were exposed to 80 KV-X-rays and Kr-Ions (energy: 11.75 MeV/u; LET: 3500 KeV/microns). Emergence, hatching and survival were determined. The results demonstrate a very high resistance both to sparsely and ionizing radiation.

Animals↗