Duplex and color Doppler sonography were used to assess the vascular status of 240 impotent patients. The tests were performed before and after intracorporal injection of a standard dose of a vasoactive mixture and measurements were done both at the crura and at the midshaft of the penis. Particular care ...

To find the maximal depth of an ecstatic vessel in the dermis that contributes to the abnormal color of a port wine stain (PWS), "normal" and "laser treated PWS skin" are modeled, respectively, as a two-layer plane parallel geometry consisting of an epidermis and a dermis, and as a three-layer ...

The purpose of this article was to investigate the detection rate of gastroduodenal artery blood flow (GDABF), and to measure its velocity and volume flow rate using Doppler color imaging. The GDABF was detected in 40 of 41 (98%) normal subjects with longitudinal scanning and in 36 (88%) with transverse ...

Transvaginal color Doppler was performed in 198 volunteer pregnant women whose menstrual age ranged from the fifth to the twelfth week. In all patients an attempt was made to obtain signals from both uterine arteries, peritrophoblastic/retroplacental vessels, umbilical arteries, fetal aorta, intracranial vessels, and corpus luteum flow. With the combination ...

Reperfusion injury has been well documented in organs other than testis. An experimental study was conducted to investigate reperfusion injury in testes via the biochemical changes after unilateral testicular torsion and detorsion. As unilateral testicular torsion and varicocele have been shown to affect contralateral testicular blood flow, reperfusion injury was ...

Color flow Doppler sonography (CFDS) has been used to evaluate the blood flow to the testes, because of its ability to visualize small vessels with low flow. A total of 39 infertile men, 18 with clinical varicocele and 21 without, were examined using CFDS to assess the clinical usefulness of ...

We evaluated a flow cytometric method for determining the proportion of CD4-positive T lymphocytes in whole blood using a single three-color tube containing fluorochrome-labeled CD45, CD3, and CD4. Various ways of gating this sample were evaluated and results were compared with data obtained in our standard six-tube, two-color assay gated ...

The differentiation of the causes of acute scrotal pathology by clinical means alone is prone to inaccuracy, resulting in inappropriate surgical exploration. Colour Doppler imaging (CDI) provides the facility to assess blood flow. Torsion of the testis impedes blood flow, whereas it is enhanced or normal in inflammatory pathology. We ...

The commercially manufactured contrast agents, Echovist and Albunex, were compared with sonicated conventional agents, indocyanine green, 29% renografin-60, 0.9% normal saline and 25% mannitol in their ability to enhance color Doppler flow signals. In a pneumatically regulated pulsatile flow system, a glycerine, saline (0.9%) and sand (5 microns particle size) ...

Endovaginal ultrasound (US) imaging and color Doppler flow imaging techniques were used to evaluate the uterus and its contents and to establish characteristics of a normal post-abortion appearance in 19 women who underwent elective first-trimester abortions. Twenty-two examinations were performed between 2 and 17 days after the procedure. Thirteen of ...

A laminar color Doppler flow was discovered in the pericardial space in a 35-year-old man with postpericardiotomy effusive constrictive pericarditis. The flow was detected by transesophageal color Doppler echocardiography. A further pulsed Doppler study revealed a to-and-fro flow, which was synchronized with the cardiac rhythm. We hypothesized that this flow ...

Neovascularity in a VX2 carcinoma in rabbit liver was detectable, using an ultrasonic color Doppler flow imager. Intraportal infusion of heated saline increased the fractional area of color flow Doppler signals by at least 5% and as much as 30%, within and surrounding the tumors of all six rabbits studied. ...

Using a new flow-test phantom, which respects the acoustic properties of real blood as well as the proximal and distal impedances of body circulation, we assessed the performance of two duplex sonography signal processors on blood-flow measurements. With both the analog and the dynamic signal processor (Fast Fourier Transform), the ...

RATIONALE AND OBJECTIVES: The authors developed and tested a technique to noninvasively measure ureterovesical junction (UVJ) pressure gradients. Such a technique could be used to evaluate ureteral reflux and obstruction. METHODS: Color Doppler ultrasound measurements of an in vitro model of the ureteral jet were performed. RESULTS: The authors show ...

The detection of shunts at the atrial level is important, and a reliable means of diagnosis is required. Precordial contrast echocardiography is usually performed to detect such shunts. To investigate the advantages of transesophageal echocardiographic techniques, we studied 167 consecutive patients with both precordial and transesophageal echocardiography, using two-dimensional imaging ...

OBJECTIVE: The purpose of this study was to evaluate the Doppler imaging characteristics of femoral artery pseudoaneurysms occurring after cardiac catheterization to determine if color Doppler sonography can be used to predict which pseudoaneurysms would ultimately thrombose spontaneously. MATERIALS AND METHODS: Over a 30-month-period, 24 pseudoaneurysms were studied with serial ...

Several studies in the rat indicate that opioid peptides produced in the testicular interstitial compartment can affect events in the tubular compartment. For example, it is thought that some specific functions of Sertoli cells, such as androgen-binding protein production are decreased by a paracrine mechanism. In this study ACTH beta-endorphin ...

The effect of testosterone supplementation on testicular blood flow, testicular vasomotion, the number of polymorphonuclear leucocytes (PMN's) in testicular blood vessels and prostatic blood flow were studied in rats in which the Leydig cell had been destroyed specifically by a single injection of ethane dimethylsulfonate (EDS). Other rats were supplemented ...

We examined the relation between left ventricular (LV) flow dynamics measured by color Doppler, and either global or regional LV function in 19 normal subjects (group 1), in 55 patients with old myocardial infarction (MI) (29 without [group 2] and 26 with LV aneurysm [group 3]), and in 16 with ...

Treatment of adult rats with 25 iu follicle-stimulating hormone (FSH) did not influence testicular blood flow, serum testosterone, vasomotion or intravascular leucocyte concentration at 6, 12 and 24 h after treatment. Treatment of adult rats with 50 iu pregnant mare serum gonadotrophin (PMSG) resulted in a two-fold increase in testicular ...

In attempting to determine whether or not multiple injections of human chorionic gonadotropin (hCG) augment testis blood flow, adult male rats were injected with three doses of 10 IU of hCG every other day and testis blood flow was determined on day 5, the day of the final injection. Testis ...

A case of placenta previa/accreta was diagnosed at 23 weeks' gestation using color Doppler ultrasound. Imaging showed an unusually intense blood flow within the placental sonolucent spaces and the hypervascularization patterns within the placental and the non-placental tissues. Highly pulsatile venous flow patterns were detected within the placental blood lakes ...

Contralateral testicular blood flow was measured by the intratesticular injection of 133Xe in 9 controls (Group 1) and in 34 adult male albino rats with experimentally induced left testicular torsion. In Group 2 (n = 9) testicular torsion was maintained for 3 h; in Group 3 (n = 7) torsion ...

Accuracy of two systems--conventional (DRF 400, Diasonics) and color-coded (Angiodynograph, Quantum/Phillips) image-directed Doppler ultrasonography--was investigated using an in vitro model that generated both monophasic and triphasic pulsatile flow patterns. Estimated and actual blood volume flow rates showed good correlations, but the sampling with a hand-held transducer led to wide variations ...

RP-30A is a radioactive tracer being evaluated for the detection of regional myocardial blood flow. This study compares RP-30A to technetium 99m pertechnetate as radioactive tracers for the detection of testicular blood flow changes in early testicular torsion. The left testis of adult male Sprague-Dawley rats was subjected to either ...

Thirty-four patients were operated on by the technique of three-contrasts method hysteroscopy in this article. In three-contrasts method hysteroscopy, sonography guidance was used instead of laparoscopy guide. The distending medium introduced into the uterus during hysteroscopy and injected normal saline into the bladder and abdomen (which flowed into the posterior ...

Dramatic changes occur in the circulation of the newborn during the transition from fetal to neonatal life. Closure of the foramen ovale and ductus arteriosus, decrease in pulmonary vascular resistance, and improvement in right ventricular compliance are among these changes. These physiological-anatomical events were characterized by means of two-dimensional, Doppler ...

Color Doppler sonography can be useful in the evaluation of erectile dysfunction, which can result from psychogenic, endocrinologic, neurogenic, pharmacologic, and vasogenic causes. It is used to determine the integrity of the vascular mechanism. After an intracavernosal injection of a vasodilatory agent, color Doppler sonography is performed to evaluate cavernosal ...

We examined 63 patients with 31 symptomatic and 44 asymptomatic carotid stenoses with Doppler color-flow imaging (DCFI); conventional Doppler duplex had shown a hemodynamic obstruction (greater than or equal to 80% stenosis) in all patients. Analysis of plaque surface morphology demonstrated more ulcerated plaques in symptomatic (43%) than asymptomatic (23%) ...

A newborn with a leptomeningeal cyst over the anterior fontanelle due to birth trauma is described. Color Doppler flow sonograms were helpful to diagnose the leptomeningocele in its early stages and to differentiate it from a cephalhematoma or subgaleal haemorrhage by demonstrating cerebro-fugal flow in an arterial connection between the ...

Duplex ultrasound with pulsed Doppler and color flow sonography were used to image the penis and conduct blood flow velocity studies in 5 patients. Cavernous body cross sectional area, cavernous artery diameters and peak systolic velocities were measured in the flaccid shaft, after transient exposure to negative pressure in a ...

Testicular blood flows during unilateral testicular torsion were measured by Xenon-133 clearance technique. Xenon-133 was injected via the left carotid artery into the heart. Measurements were performed in control and left-sided testicular torsion groups, each consisting of ten rats. Left and right testicular blood flows, which were 29.157 +/- 2.272 ...

Ten cases of adenopathy, 7 inflammatory and 3 lymphomatous in origin, with visible increased blood flow on color flow Doppler examination are presented. Although the ultrasonic demonstration of blood vessels in enlarged lymph nodes, both inflammatory and tumoral, is not new [1-5], we believe that this is the 1st definitive ...

DCI acquires Doppler-shifted echoes from a cross-section of tissue scanned by an ultrasound beam. These echoes are then presented in color and superimposed on the gray-scale anatomic image of non-Doppler-shifted echoes received during the scan. The flow echoes are assigned colors according to the color map chosen. Usually red, yellow, ...

We studied surface adherence and its effects on color Doppler jet areas and color encoding in an in vitro model with a noncompliant receiving chamber into which a steady flow jet was directed parallel to either a straight or a curved surface adjacent to and 4 mm away from the ...

The capacity of a multi-gate pulsed Doppler (MPD) system and Doppler color flow imaging (DCFI) for the evaluation of flow patterns was studied in 14 patients with 17 nonstenotic carotid plaques (luminal narrowing less than 40%). Plaque morphology was assessed by means of a high-resolution B-mode system with subsequent three-dimensional ...

Transcatheter closure of Patent Ductus Arteriosus (PDA) was done in 18 children using the USCI Rashkind PDA occluder system. Patient age ranged from 1.2 to 14 years and their weights ranged from 8 to 36 kg. Isolated restrictive PDA was present in 15 patients; 3 had additional cardiac defects. The ...

Adult rats were hemi-orchidectomized and various aspects of testicular blood flow, microcirculation and vascular morphology were studied in the remaining testis after 30 days and compared to that in intact sham-operated animals. Testis weight, total testicular blood flow (measured with microspheres), capillary blood flow pattern (studied with laser Doppler flowmetry) ...

The presence of mirror artifacts in color Doppler has been noted by others. In that report, the artifact arose from scattering at the smooth vessel wall and appeared as signal outside the lumen of the vessel, but with no change in flow direction. As experience increases, recognition of the artifacts ...

We performed color Doppler sonography in six patients with arteriovenous malformations of the kidneys. The diagnosis was established by angiography in all patients. Color Doppler sonograms were obtained at a large Doppler frequency-shift range (55 cm/sec of maximal average flow velocity at zero Doppler angle) to depict high-velocity blood flow ...

By color-coded duplex sonography moving structures are visualized as red or blue colors within a normal gray-scale B-mode ultrasound image. Thus, blood flow even within small vessels can be visualized clearly. Color-coded duplex sonographic examination was performed in 11 patients who presented with scrotal pain. This method proved to be ...

Color Doppler ultrasonography (US) is an increasingly important tool in the evaluation of the scrotum, especially in acute scrotal disorders. With this modality, arterial flow is readily detected in the normal spermatic cord and testis but is not seen in the epididymis; venous flow is not seen anywhere in the ...

Characteristics of transesophageal color Doppler flow mapping of iatrogenic left-to-right interatrial shunts were assessed in 58 patients, 1 to 994 days after percutaneous transluminal mitral valvotomy. Transesophageal color Doppler flow mapping detected 22 cases of interatrial shunt whereas transthoracic two-dimensional echocardiography visualized only five interatrial septal defects. Five types of ...

In this study we have selected a group of patients affected by a more or less severe condition of varicocele. After the evaluation of spermatogenesis and sperm function by electron microscopy we have demonstrated that the sperm malformations are mostly due to immaturity. Subsequently we have observed low FSH levels ...

An accurate but simple and noninvasive method for quantifying flow across a ventricular septal defect has yet to be implemented for routine clinical use. A region of flow convergence is commonly imaged by Doppler color flow mapping on the left septal surface of the ventricular septal defect, appearing as a ...

This manuscript describes a new method, validated in in vitro models, for quantitating volume flow rate across an orifice with Doppler color flow mapping. Flow through a narrowed orifice is characterized by the convergence of radial streamlines proximal to the orifice. In this color Doppler method, one or more isovelocity ...

Doppler color flow mapping is widely used in fetal echocardiography. We studied the impact of color flow mapping on fetal cardiac diagnosess. Between January 1, 1989 and June 30, 1990, we performed 854 fetal echocardiograms on 776 fetuses. Color flow mapping was used in 45 of 48 fetuses diagnosed as ...

The coding theory of rotations (by inspecting closely their relation to flows) and the continued fractions algorithm (by considering even two-coloring of the integers with a given proportion of, say, blue and red) are revisited. Then, even n-coloring of the integers is defined. This allows one to code rotations on ...

A technique for rapidly collecting blood of testicular origin is described, one which can provide sufficient plasma amounts to investigate some steps of testicular steroid biogenesis in vivo in 2 species. In adult male rats, testosterone (T), androstenedione (4A) and 5-androstenediol (5AD) were determined in pampiniform plexus testicular venous blood ...

Thirty-six patients with acute spontaneous subarachnoid hemorrhage (26 caused by rupture of an aneurysm) were examined by transcranial color-coded real-time sonography by using a 2.25-MHz ultrasound transducer. In 20 of these 26 patients (76%), the aneurysm could be identified by a characteristic abnormal blood flow pattern within the aneurysm in ...