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Biomedical subjects

H Moseley

Publications and source records attributed to H Moseley.

106 records · Page 6Linked to original sources
PubMed1981

Exposure of physiotherapists to microwave radiation during microwave diathermy treatment.

Power density was measured during several microwave diathermy treatment sessions in order to determine levels to which the physiotherapist might be exposed during normal practice. Measurements were made at a distance of 30 cm from the patient. In half the cases investigated readings were less than 10 mW cm-2, the maximum permissible level for continuous exposure during an 8-hour working day. In the other cases levels exceeded 10 mW cm-2 at some sites. The results indicate that physiotherapists are unlikely to be exposed to radiation levels which would be considered harmful, provided reasonable care is taken.

Diathermy↗
PubMed1981

Personal solar UV-A doses received by patients undergoing oral psoralen photochemotherapy for psoriasis.

Patients undergoing oral psoralen photochemotherapy (PUVA) for psoriasis receive a known amount of UV-A in the treatment cubicle and an unknown amount of UV-A from sunlight. In order to measure the solar UV-A dose, fifty-six patients received a UV-sensitive film badge to be worn from the time they took their psoralen tablet throughout the course of the day, except during treatment. The UV-A doses measured in this way varied from less than 0.2 J cm-2 to 7 J cm-2, with a median of around 1 J cm-2. These results show that the solar UV-A received by patients who have been photosensitized by 8-MOP may not be insignificant in relation to the treatment dose.

Film Dosimetry↗
PubMed1980

Observations on the 32P uptake test.

The results of the 32P uptake test in the diagnosis of intraocular malignancies is presented. The tests were carried out with the use of newly developed eye probe. A quantitative comparison of different control sites is described, and a statistical analysis has been conducted on the counts obtained during the uptake procedure.

Diagnosis, Differential↗
PubMed1979

The trabecular wall of Schlemm's canal: a study of the effects of pilocarpine by scanning electron microscopy.

The scanning electron microscope was used to study the endothelium lining the trabecular wall of Schelemm's canal in 10 human eyes enucleated in treatment of choroidal melanomas. The eyes of 5 patients had been treated before enucleated with pilocarpine drops, and the remaining 5 were untreated and served as controls. In the pilocarpine-treated tissue there was an increased prominence of cellular bulges in the endothelial monolayer, and the endothelial pores were both larger and more frequent than in the untreated eyes. By the use of Poiseuille's formula it was calculated that the resistance offered by the pore system to the drainage of aqueous in the pilocarpine-treated group was approximately one-ninth of that in the control series.

Choroid Neoplasms↗
PubMed1979

Low leucocyte ascorbic acid levels and corneal ulceration.

The leucocyte ascorbic acid levels were determined in six patients with infected corneal ulcers. These levels were significantly lower than in a control group matched for age and sex. The potential role of Corynebacteria as pathogens is discussed.

Adult↗
PubMed1977

Removal of AC interference from the electrocardiogram.

A method is described for the removal of AC interference from the electrocardiogram in monitors which do not have isolated inputs. The patient's leads are connected to an isolation amplifier which provides isolation between the input and the output and has a high common mode rejection ratio. The output from the isolation amplifier is taken to the electrocardiographic monitor. The isolation amplifier not only provides additional patient safety but also reduces the level of AC interference without interfering with any frequency components in the electrocardiogram.

Amplifiers, Electronic↗
PubMedDate not supplied

Stray RF field strength during radiofrequency endometrial ablation.

A study has been carried out of the RF field strength around a total of 17 patients undergoing radio-frequency endometrial ablation in three hospital centres. The mean equivalent power density at the position of the surgeon exceeded 10 W m-2, which is the derived investigation level for exposure to electromagnetic fields. This value is derived from a basic restriction in the average specific absorption rate in the body to 0.4 W kg-1. This limit applies to general population as well as occupational exposure and is well below that which has been shown to be hazardous to health. Also, the working conditions did not place physical stress on the surgeon. The maximum value of the specific energy absorption rate in the head or trunk should not exceed 10 W kg-1. Measured values on the field strength suggest that this organ dose limit was not exceeded. It is concluded that staff exposure to stray RF radiation during radio-frequency endometrial ablation is not considered to be hazardous to health.

Catheter Ablation↗