Preliminary study of the upper limb with the use of ultrasound transmission imaging.

A biologically safe, noninvasive method for visualizing bone and soft tissue relationships has been developed recently. Termed the ultrasonic transmission imaging system, its advantages include visualization of soft tissues in real time while motion is underway. The image can be correlated to standard x-ray films, but since no ionizing radiation is involved, repeated risk-free visualization of extremities for either diagnostic assessment or biomechanical studies is permitted.

Canadian experience with high intensity focused ultrasound for the treatment of BPH.

INTRODUCTION: High Intensity Focused Ultrasound (HIFU) ablates benign prostatic tissue in a minimally invasive manner with low morbidity. The safety and effectiveness of treating of benign prostatic hypertrophy (BPH) with HIFU using 3 different protocols are reported. METHODS: Forty six male patients with a mean age of 65 (range 47-84) were treated using the Sonablate HIFU device (Focus Surgery, Indianapolis IN) with 3 different protocols at 3 centres (LDS n=20, PJP n=12, RWC n=14).

Noninvasive surgery of prostate tissue by high intensity focused ultrasound: an updated report.

Objective: To establish clinical efficacy and safety of High Intensity Focused Ultrasound (HIFU) for the treatment of benign prostatic hyperplasia (BPH) in a multiple site clinical study.

Methods: Seven clinical sites were set up for the studies, five in the USA, one in Canada and one in Japan respectively. Sixty two patients were enrolled in these three studies.

Early experience with high-intensity focused ultrasound for the treatment of benign prostatic hypertrophy.

Objective: To evaluate the safety and effectiveness of high-intensity focused ultrasound (HIFU) in patients with benign prostatic hypertrophy (BPH).

Patients And Methods: The study comprised 25 patients (mean age 67 years: range 47-84) with BPH treated using the Sonoblate HIFU device. Patients were evaluated before and after one treatment of HIFU using the American Urological Association (AUA) symptom score, peak urinary flow rate (Qmax) and a quality-of-life (QOL) score, and any complications were noted.

Focused ultrasound: the future of noninvasive surgery.

Medicine is ever changing, as is the discipline of surgery. During the last decade, surgery has experienced a technological renaissance driven primarily by the desire to provide patients less invasive surgical treatments with shorter operating times, hospital stays, and recuperative periods. Many traditional open surgical procedures are now being replaced with endoscopic and laparoscopic techniques.

Reflex transmission imaging improves ultrasonic visualization and characterization of calculi for lithotripsy applications.

A new ultrasound technique combining reflex transmission imaging (RTI) and integrated reflection C-scan (IRCS) imaging is being developed to enhance visualization of calculi for lithotripsy applications. Reflex transmission imaging/integrated reflection C-scan ultrasound produces orthographic images (similar to flat-field x-ray films) that improve the delineation of stone from soft tissue. Integrated reflection C-scan imaging is based on reflectivity while RTI is based on transmissivity of structures (stones) in the focal plane.

Carotid duplex sonography: a multicenter recommendation for standardized imaging and Doppler criteria.

A complex duplex carotid evaluation involves high resolution imaging and characterization of the carotid plaque as well as quantitative Doppler spectral analysis to determine the presence and degree of flow restriction. Each of the components of the examination is essential to evaluate the carotid arteries adequately for the presence of disease. Both of these components should be assimilated into a final report that can be used to determine who is at risk for embolic as well as flow restrictive disease.

Vasculogenic impotence evaluated by high-resolution ultrasonography and pulsed Doppler spectrum analysis.

Vasculogenic impotence was evaluated by high-resolution sonography and quantitative Doppler spectrum analysis in 21 patients and two normal volunteers. Erection was induced by intracorporeal injection of papaverine, and B-scan imaging and Doppler analysis were performed with the penis flaccid and erect. The corpora cavernosa and its deep arteries, median septum, and corpus spongiosum were clearly displayed in every subject, with the dorsal vein and dorsal artery seen ventral to the corpora cavernosa.

Preliminary study of the upper limb with the use of ultrasound transmission imaging.

A biologically safe, noninvasive method for visualizing bone and soft tissue relationships has been developed recently. Termed the ultrasonic transmission imaging system, its advantages include visualization of soft tissues in real time while motion is underway. The image can be correlated to standard x-ray films, but since no ionizing radiation is involved, repeated risk-free visualization of extremities for either diagnostic assessment or biomechanical studies is permitted.

Preliminary study on the use of ultrasonic transmission imaging to evaluate the hip joint in the immature dog.

Real-time ultrasonic transmission imaging presents an orthographic image of anatomy similar to that obtained with X-ray fluoroscopy. Transmission imaging allows visualization of the dynamic interaction of muscle, cartilage, bone, tendon and joints during selective palpation and movement. The hip joints of deceased dogs, 7-8 weeks of age, were sonographically evaluated at various levels of dissection and correlated with anatomic features.

Potential for clinical use of the analytical laser microprobe for element measurement.

Use of the laser microprobe for rapid emission spectroscopic analysis of elements in microscopic samples of biological material is described. The technique depends on vaporization of the microsample with a focused laser beam at a temperature that renders the vapor incandescent for spectrochemical analysis. Spectral line intensities are recorded photographically with densitometry of the negatives or photoelectrically.

Real-time imaging with a new ultrasonic camera: part I, in vitro experimental studies on transmission imaging of biological structures.

Results are described of in vitro biological experimentation using a new through-transmission ultrasonic camera system developed at the Stanford Research Institute. The camera system produces real-time focused, orthographic images of a 15 times 15 cm field. The in vitro studies, which demonstrate the diagnostic potential of the new technique, include transmission images of selected excised organs such as liver, kidney, spleen, and uterus.