RESUMO
The aim of the present study was to test the hypothesis that ultrasonic propagation properties in skin and wound tissue would correlate with material properties such as collagen content, water content, and tensile strength of those tissues. Both ultrasonic speed and ultrasonic attenuation coefficient were directly correlated with tissue collagen content, [r = 0.80 and r = 0.56, respectively (p less than 0.001)]. In addition, ultrasonic speed and attenuation coefficient were inversely correlated with tissue water content, [r = -0.57 and r = -0.73, respectively (p less than 0.001)]. Tensile strength also correlated very significantly with ultrasonic speed (r = 0.90, p less than 0.001), and significantly with attenuation coefficient (r = 0.58, p less than 0.001). The results demonstrate the feasibility of using ultrasound for noninvasively determining the material properties of biologic tissues including healing cutaneous wounds.
Assuntos
Lasers , Microscopia/instrumentação , Pele/lesões , Ultrassonografia , Ferimentos Penetrantes/patologia , Animais , Colágeno/metabolismo , Cães , Lasers/instrumentação , Masculino , Ultrassonografia/instrumentação , Cicatrização , Ferimentos Penetrantes/metabolismoRESUMO
Filtration of argon laser light to eliminate the blue wavelengths and create a green-only light may be clinically useful in treating macular lesions. To that end, an inexpensive, easy method of modifying a posterior pole contact lens for use with any ophthalmic argon laser to allow only green, not blue, laser light to be used for macular photocoagulation is described.
Assuntos
Lentes de Contato , Terapia a Laser , Lasers/instrumentação , Macula Lutea/cirurgia , HumanosRESUMO
The erythrocyte magnesium content was determined using two different analytical systems (atomic absorption spectrometry and the laser microprobe mass analyzer) with specimens from 18 patients with normal renal function and from 10 patients with chronic renal insufficiency. There was a good correlation (r = 0.73) between the two analytical systems. Additionally, the laser microprobe mass analyzer was used to determine the aluminum content of plasma and erythrocytes in specimens from patients who ingested moderate quantities of aluminum hydroxide for several months. Results showed a significant elevation of the plasma aluminum concentration, but a normal erythrocyte aluminum content. The laser microprobe mass analyzer may be useful in studies of mineral metabolism in humans.