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BRL Abstracts Database |
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Your search for ultrasound produced 3296 results. Page 66 out of 330
| Title |
Chromosome breakage and ultrasound. |
| Author |
Boyd E, Abdulla U, Donald I, Fleming JE, Hall AJ, Ferguson-Smith MA. |
| Journal |
Br Med J |
| Volume |
|
| Year |
1971 |
| Abstract |
Human lymphocyte cultures were examined for chromosome damage after exposure to ultrasound. Control and treated slides were scored "blind" and showed no evidence of damage due to ultrasound. Neither was there evidence of chromosome damage in blood cultures from six infants whose mothers had ultrasound during pregnancy when compared with that from six infants whose mothers had not. Our results suggest that if ultrasound causes chromosome damage, it does so with less frequency than acceptable levels of x-irradiation. |
| Title |
Chromosome breakage and ultrasound. |
| Author |
Davis TG. |
| Journal |
Br Med J |
| Volume |
|
| Year |
1971 |
| Abstract |
No abstract available. |
| Title |
Clinical application of an ultrasound attenuation coefficient estimation technique for liver pathology characterization. |
| Author |
Kuc R. |
| Journal |
IEEE Trans Biomed Eng |
| Volume |
|
| Year |
1980 |
| Abstract |
Certain diffuse liver diseases, such as hepatitis and cirrhosis, are difficult to diagnose from the information contained in ultrasound images. A signal processing procedure is described which estimated the value of an acoustic attenuation coefficient of the liver in vivo from reflected ultrasound signals. The results of a clinical trial involving 14 patients indicate a correlation between the coefficient values and the liver diseases: inflamed livers produced lower values than cirrhotic livers. A series of 15 examinations on a volunteer indicates that the observed values are repeatable to within the statistical variation predicted by the mathematical model. |
| Title |
Clinical benefit of higher acoustic output levels. |
| Author |
Kremkau FW. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1989 |
| Abstract |
No abstract available. |
| Title |
Clinical diagnostic application of ultrasound in brain disorders (sono-encephalography). |
| Author |
Grossman CC. |
| Journal |
Dis Nerv Syst |
| Volume |
|
| Year |
1964 |
| Abstract |
No abstract available. |
| Title |
Clinical evaluation of a new apporach in the treatment of contracture associated with hip fracture after internal fixation. |
| Author |
Lehmann JF, Fordyce WE, Rathbun LA, Larson RE, Wood DH. |
| Journal |
Arch Phys Med Rehabil |
| Volume |
|
| Year |
1961 |
| Abstract |
Based on previous studies, it was assumed that ultrasound is the only heating agent which can raise the temperature in and around the hip joint to therapeutic levels and which can be used safely in the presence of metallic implants. Physiologically, ultrasound increases extensibility of tight periarticular structures and scar tissues; it also has a pain-relieving effect. Thus, if used in conjunction with other physical therapy procedures, it could be anticipated that ultrasound would be most effective in treating the joint contractures which tend to develop in the elderly patient with hip fracture after internal fixation. A statistical comparison of the results obtained with ultrasound and those obtained with infrared showed that ultrasound was significantly more effective. The study also clinically confirmed the safe use of ultrsound in the presence of metallic implants. |
| Title |
Clinical evaluation of manual, automated and 3-D ultrasound imaging of breasts compressed in the same position modes applied in x-ray mammography. |
| Author |
Romilly-Harper AP, Kelly-Fry E, Dines KA. |
| Journal |
Proc Ninth Int Congr Ultrason Ex Breast |
| Volume |
|
| Year |
1995 |
| Abstract |
From a diagnostic standpoint, the differences in the orientation of internal breast structures for a patient being examined by x-ray mammography, in comparison to a patient undergoing ultrasound sometimes can be in error. The primary purpose of this study is to clinically evaluate a breast imaging instrumentation system(1-3) designed to provide direct correlation between x-ray and ultrasound mammography. An additional purpose is to demonstrate the significant advantages of this new ultrasound instrumentation technique, in comparison to current ultrasound mammography methods, for patients who only require ultrasound examinations. |
| Title |
Clinical evaluation of ultrasound techniques in breast tumors and malignant abdominal tumors: I - Differential diagnosis of breast tumors by the sensitivity graded method of ultrasonotomography and proposal of new differential criteria and its diagnostic |
| Author |
Kobayashi T. |
| Journal |
Proc Second World Congr Ultrason Med - Rotterdam |
| Volume |
|
| Year |
1973 |
| Abstract |
No abstract available. |
| Title |
Clinical relevance of pressure-dependent scattering at low acoustic pressures. |
| Author |
Emmer M, Vos HJ, Wamel AV, Goertz DE, Versluis M, Jong ND. |
| Journal |
Ultrasonics |
| Volume |
|
| Year |
2007 |
| Abstract |
Recent optical and acoustical studies have shown a threshold behaviour in the response of phospholipid-coated contrast agents, for a certain range of sizes. Below the acoustic pressure threshold, the microbubbles' scattering efficacy is significantly reduced compared to that above the threshold. Here we investigate the clinical relevance of the observed threshold behaviour. A cardiac ultrasound scanner system was used to analyse the pressure-dependence of the scatter intensity. The scattering of a native suspension of a phospholipid-coated contrast agent was compared to that of a suspension in which microbubbles with a size larger than 3.0 microm in diameter were extracted. A power modulation scheme at the fundamental frequency was applied. After linearly scaling and subtracting the B-mode images recorded at 70 and 200 kPa, the contrast-to-tissue ratio (CTR) of the native suspension was 3.2dB, whereas the CTR of the filtered suspension was 20 dB. The 17 dB difference is attributed to the threshold behaviour. Well-established ultrasound imaging techniques such as fundamental power modulation imaging could benefit from the pressure-dependent scattering properties of this type of contrast microbubbles. |
| Title |
Clinical results of real-time ultrasonic scanning of the heart using a phased array system (1,2). |
| Author |
Kisslo JA, vonRamm OT, Thurstone FL. |
| Journal |
Yale J Biol Med |
| Volume |
|
| Year |
1977 |
| Abstract |
This report describes the operating characteristics and initial clinical results of a new echocardiographic system that produces real-time, high resolution, cross-sectional images of the heart. This system relies upon phased-array principles to rapidly steer and focus the ultrasound beam through the cardiac structures under investigation. A hand-held, linear array of 24 transducers is manipulated on the patient's chest to direct the interrogating plane at various cardiac structures. Images of high line density are presented in selectable sector ares to a maximum of 90 degrees. This imaging system has been used clinically in over 2,000 patients in the past two and one-half years. Its use in the detection of altered states of ventricular and valvular pathology has been described. |
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