Due to the unavoidable problem of aliasing, color flow signals from high blood flow velocities cannot be measured directly by conventional color Doppler. A new technology termed Quantitative Un-Aliased Speed Algorithm Recognition (Quasar) has been developed to overcome this limitation. Employing this technology, we used transesophageal color Doppler echocardiography to ...

The objective of the investigation was to determine what effect intracranial pathology has on alterations of superior sagittal sinus blood flow, and to determine the role of color flow Doppler imaging of the superior sagittal sinus in the diagnosis of intracranial pathology in the neonate and infant. One hundred examinations ...

A method is presented that estimates the local blood flow in the mucosa of the organs of the upper gastrointestinal tract; the method is based on the analysis of endoscopic true-color images. The quantity of blood flow is approximated by the estimation of the hemoglobin concentration in the mucosa. The ...

The aim of this study was to characterize the appearance of the vascular pattern of endometriomas in terms of color Doppler and to verify the role of Doppler flow indices in differentiating endometriomas from other pelvic masses. Twenty patients with suspected endometriosis were referred for evaluation and surgical management of ...

Thirteen cases of primary adenocarcinoma of the gallbladder (GB), 1 of malignant fibrous histocytoma, 3 of metastatic adenocarcinoma, 5 of adenoma, 5 of polypus, 2 of xanthogranuloma, 6 of chronic cholecystitis, 4 of acute cholecystitis, and 8 of subacute cholecystitis were studied by image-directed and color Doppler ultrasonography (CDUS). All ...

We report here a rare case of adult acute idiopathic scrotal edema (AISE). Its characteristics and management are the same for adults as for prepubertal boys. AISE typically affects prepubertal boys, with an acute onset of a relatively painless scrotal erythema and subcutaneous edema, which resolves spontaneously, without sequela, in ...

OBJECTIVES: To assess the effect of varicoceles on testicular blood flow in man. METHODS: Testicular blood flow was measured in 248 consecutive men attending an infertility clinic and 34 fertile volunteers using color duplex ultrasonography. RESULTS: The testicular blood flow of men with either clinical and/or subclinical varicoceles was not ...

The Doppler ultrasound with color flow mapping image has been recently applied for the evaluation of gynecologic diseases, in particular, malignant trophoblastic tumors with the characteristic abundant blood flow. Doppler color flow mapping of uterine artery and intratumoral blood vessels was performed at a regular interval in all 26 patients ...

We directly compared the utility of agitated saline solution contrast echocardiography and color flow Doppler with both transthoracic and transesophageal echocardiography in the detection of patient foramen ovale (PFO). Forty-three patients referred for contrast echocardiography and transesophageal echocardiography were prospectively studied. Three were excluded because of technically inadequate contrast, and ...

Clinical and experimental studies have shown that, in unilateral testicular torsion, some structural and hormonal changes may occur in the contralateral testis. The present study was designed to determine the effect of unilateral ovarian torsion on the blood flow in the contralateral ovary using #133Xe. Basal blood flow of the ...

Transesophageal echocardiography (TEE) combined with color and pulsed Doppler allows a noninvasive assessment of flow in the proximal anterior descending coronary artery (LAD). The aim of this study was to assess whether the peripheral administration of a transpulmonary stable echocontrast agent with prolonged in vivo stability may improve the feasibility ...

Doppler ultrasonography was used to examine 198 neck-vein systems (67 right, 131 left) in 148 patients. The vessel lumen is usually echo-free: the veins are supple, and the internal jugular and sometimes the subclavian veins can be compressed. The venous confluence is Y-shaped. Blood flow was symmetrical and biphasic in ...

Varicocoeles could be classified into stop-type and shunt-type. In stop-type varicocoeles, only the internal spermatic (testicular) vein is dilated and needs to be ligated. In shunt-type, both internal spermatic vein and external spermatic (cremasteric) vein are dilated due to incompetence of the cremasteric system and both venous systems require ligation. ...

The association between male subfertility and varicocele has long been recognized. Physical examination is the most widely used method for detecting varicoceles but other techniques may be more sensitive. Color Doppler sonography has the theoretical advantage of allowing direct demonstration of reversed flow in the testicular veins. The frequency of ...

Graded compression color Doppler sonography was used to evaluate gastrointestinal blood flow in 20 normal fasting subjects and 32 patients with focal gastrointestinal lesions. Imaging was optimized for color sensitivity using a 5 MHz linear array transducer. Criteria were established for normal mural blood flow based on findings in normal ...

Cyanide determination in whole blood can be performed by spectrophotometry after using diffusion coupled with coloration by hydroxocobalamin in a Conway dish. The technique may be accelerated by the use of a heating sheet at 45 degrees C. The method proved to be specific, sensitive, and fast, thus permitting measurements ...

We studied the efficacy of color Doppler sonography in the transcutaneous assessment of acute changes in microvascular flow. Arterial and venous occlusion studies were performed in rabbits after simple isolation of the common femoral artery and vein and after raising an epigastric island flap. Vessel diameters were measured through an ...

We have developed a method to provide the two-dimensional distribution of blood flow velocity and the blood flow volume rate in the ascending aorta from the cross-sectional Doppler color flow image. Regional blood flow velocities were determined by converting color intensities of the cross-sectional Doppler color flow image into the ...

BACKGROUND: Neuroblastoma is the second most common malignant tumor of childhood. With the increasing use of ultrasound, prenatal recognition of this tumor is becoming more common. CASE: A 33-year-old woman presented at 38 weeks' gestation. A mass at the level of the left fetal renal pole was identified upon ultrasonography. ...

Colour Doppler imaging (CDI) potentially provides the facility to differentiate torsion of the testis from inflammatory pathology. Normal control data are required for the purposes of interpretation of abnormal findings. Fifty boys with normal testes were examined by CDI using the Acuson 128XP System. Testicular blood flow was demonstrated in ...

Duplex and color Doppler sonography have proved to be excellent noninvasive modalities for evaluating complications of percutaneous interventional vascular procedures. Complications including hematoma, pseudoaneurysm, arteriovenous fistula, thrombosis, stenosis, and vessel occlusion are routinely diagnosed with Doppler sonography. Hematomas exhibit variable echogenicity and internal complexity but never demonstrate internal blood flow. ...

PURPOSE: To describe the color Doppler ultrasound (US) features of hepatocellular adenoma (HA) and correlate these findings with pathologic findings, with special emphasis on the blood vessels. MATERIALS AND METHODS: Color Doppler US was prospectively performed in eight patients with histologic proof of HA. Eleven lesions were studied. RESULTS: In ...

OBJECTIVE: To assess flow characteristics of benign and malignant gynecologic tumors by transvaginal color flow Doppler. METHODS: Records of the Ultrasound Laboratory, Women's Cancer Center, University of Minnesota were analyzed retrospectively. Gray scale findings were recorded as either "diagnostic" or "nondiagnostic." Color flow assessment was performed on intratumor vessels or ...

Color Doppler imaging was performed to evaluate the venous stasis in 39 orbits, including 9 optic neuropathy orbits, of 20 patients with dysthyroid ophthalmopathy and 22 orbits of 11 healthy subjects. The superior ophthalmic vein (SOV) was detected in 26 dysthyroid ophthalmopathy orbits and in 13 control orbits. The blood ...

We report the use of color, flow-directed transesophageal Doppler in the evaluation of aortic coarctation. Transesophageal echocardiography (TEE) was used to define the aortic shelf in two adults with mild and moderate postductal coarctation, respectively. The color mosaic pattern aided in identification of the coarctation location and orifice diameter. Continuous ...

OBJECTIVE: This study was conducted to evaluate the role of transvaginal color Doppler ultrasonography in detecting endometrial carcinoma in postmenopausal women and in evaluating the depth of myometrial invasion and tumor staging. STUDY DESIGN: A group of 750 postmenopausal women were examined by transvaginal color Doppler ultrasonography 1 day before ...

A case is reported of amputation of the testis, which was reattached to the stump of the severed spermatic cord using a microsurgical technique and local hypothermia. Total ischemia time was 4 hours and 20 minutes, including 3 hours for warm ischemia. Ultrasonography of the replanted testis 6 months postoperatively ...

Color Doppler imaging was employed to assess the uteroplacental circulation in abnormal first-trimester gestations. Included in the study were 40 blighted ova, 35 missed abortions, 10 trophoblastic diseases, and 3 ectopic gestations. Normal gestations served as a control group. Flow was detected more frequently in the blighted ova than in ...

Deep inspiration preceding Valsalva maneuver and rapid expiration immediately following it (DIVE) enhance venous blood flow on color Doppler flow imaging (CDI). The effect of DIVE was assessed in 115 consecutive lower extremity examinations. Of these, 95 or 115 (83%) had negative CDI sonograms, and 20 of 115 (17%) had ...

Three cases of posttraumatic, high-flow arterial priapism are reported. In each, targeted color flow sonography was performed, demonstrating the site of intracavernosal arterial-sinusoidal fistula. Two of the three lesions could only be detected with the use of color Doppler sonography, emphasizing its role in the noninvasive diagnostic imaging work-up of ...

OBJECTIVE: To improve the accuracy and speed of diagnosis of an ectopic tubal pregnancy by means of blood flow analysis in the tubal arteries. We hypothesized that invasion of the trophoblast increases blood flow in the tubal artery involved in ectopic pregnancy. METHODS: In 394 patients, using an endovaginal triplex ...

Testicular circulatory isolation (TCI) holds promise as a method to avoid drug-induced infertility in male patients about to receive cancer chemotherapy. Complete exclusion of blood flow to the testicle is essential to the success of this technique. We have compared the hand-held Doppler probe and radionuclide angiography (technetium-99m pertechnetate) as ...

The effect of repeated interruptions of the testicular blood flow on spermatogenesis was studied in mature Texel rams. Reversible interruption of the blood flow was achieved by an inflatable occluder, placed around the testicular artery at the level of the spermatic cord. In eight testes the blood flow was successfully ...

Eighty-five patients referred to the Women's Cancer Center, University of Minnesota had transvaginal color flow Doppler performed to determine if pelvic malignancy could be predicted by blood flow assessment. Their mean age was 49 years (range 21-86 years). Thirty-five patients were subsequently found to have malignant tumors of the cervix, ...

Color flow imaging (CFI) is a recent advance in sonography that allows simultaneous two-dimensional structural imaging and evaluation of blood flow in a noninvasive manner. The technical background and the main application in the head and neck region such as evaluation of flow through the main arteries and veins of ...

Temporary interruption of the testicular blood flow for 1 h after injection of cytostatic drugs has a protective effect on spermatogenesis. This was shown in experiments in which spermatogenesis was evaluated at four weeks after a single intravenous injection of Adriblastina (ADR; doxorubicin hydrochloride) or Mitomycin-C-kyowa (MIT). Interruption of the ...

Color Doppler sonographic images of five patients with a total of six lesions of FNH were reviewed. All cases were confirmed pathologically. All six lesions showed increased intralesional flow in comparison to surrounding liver parenchyma on color Doppler sonography. Four of the six lesions showed significant peripheral flow; two of ...

The applications of color Doppler sonography are reviewed in this article. Color Doppler is an efficient and time-saving means of assessing normal and abnormal flow in the fetus, making it an essential part of the echocardiographic examination for fetal congenital heart disease. In survey mode, color Doppler can be used ...

OBJECTIVE: To evaluate in vivo the anatomy and physiology of the normal early uteroplacental circulation. DESIGN: Forty-six women were included, all of whom continued their pregnancy into the second trimester. Color Doppler was used to identify peritrophoblastic flow, and spectral Doppler was used to analyze waveforms obtained from the different ...

Previous work in animal models has recapitulated and refined the clinical observation that longer periods of testicular torsion are associated within increased damage to the testis. Minimum times of damage-inducing torsion have not been established, however, nor has it been established to what degree blood flow returns to the testis ...

Blood samples were obtained from the testes of rats, guinea pigs and Macaque monkeys and from normal men undergoing vasectomy reversal, in order to assess the comparative dynamics of hormone secretion. In each species, blood was sampled from a vein on the surface of the testis (testicular venous blood, TV), ...

Blood flow characteristics were measured in patients with histologically proved cervical cancer and compared to normal values. Flow parameters were derived by color and pulsed Doppler ultrasound. The results showed a significant difference in the mean values of resistance index and pulsatility index among the diseased patients and healthy controls. ...

The objective of the study was assessment of the adnexal tumor vascularization with transvaginal color and pulsed Doppler sonography. Vessel location, its arrangement, and pulsed Doppler waveform characteristics were used to distinguish benign from malignant vascularity. The study was designed as a retrospective one in which sonographic and personal records ...

The objective of this study was to determine the validity of estimation of regurgitant volume by visual assessment of color flow Doppler display. An experimental apparatus was designed that is capable of ejecting precise volumes of echogenic material from one chamber to another under continuous color flow Doppler monitoring. The ...

OBJECTIVE: The purpose of our study was to evaluate the clinical significance of flow cytometric crossmatch in managing women with unexplained recurrent spontaneous abortions who have been immunized with paternal leukocytes. STUDY DESIGN: Two-color flow cytometric crossmatch was performed after immunotherapy in 69 women with recurrent spontaneous abortions to detect ...

Testicular blood flow increases bilaterally in animals with experimental left varicocele (ELV). The present experiments were undertaken to determine if increases in testicular intravascular volume and capillary growth were potential contributors to this increase in flow. Testicular intravascular volume (microliters/g) was estimated by determining testicular vascular 125I-albumin space. Microvessel mitotic ...

Volumetric flow rates were obtained in an in vivo canine pulsatile flow model using color Doppler ultrasonography (CDUS) and timed collection (TC) over a range which included laminar and turbulent flow. CDUS demonstrated increasing flow disturbance as flow rates increased, with effects on velocity profile, diameter measurements, and flow symmetry. ...

A color Doppler flow imaging technique was used to study the dynamics of cerebrospinal fluid (CSF) in infants with meningitis. Eight infants with bacterial meningitis (6) or aseptic meningitis (2) were studied with color Doppler imaging of CSF flow for a total of 18 times. In 2 infants with bacterial ...

There is a need in plastic and reconstructive surgery for a method of monitoring flaps and replants pre- and postoperatively. This study evaluates color flow Doppler done as a monitoring technique for microvascular vessels. The capability of color flow ultrasound to monitor venous and arterial insufficiency and occlusion was studied ...

OBJECTIVE: We studied benign and malignant hepatic tumors with color Doppler sonography and arteriography in order to correlate color Doppler flow characteristics with tumor hemodynamics (vascularity, arteriovenous shunting, and portal vein involvement) shown by arteriography. We also evaluated the usefulness of color Doppler flow characteristics in discriminating between tumor types. ...