TTE with color flow imaging remains the most appropriate initial method for imaging CHD in adults. In many patients with minor abnormalities, this will be the only imaging required. For complicated intracardiac anomalies not well shown by TTE, TEE or MRI are usually adequate with the choice of technique being ...

OBJECTIVE: Color velocity imaging is a color sonographic technique that uses data contained in gray-scale B-mode image scan lines to determine blood flow velocity. We prospectively determined if color velocity imaging and power Doppler sonography can be used to differentiate acute from chronic cholecystitis. We analyzed the potential role of ...

BACKGROUND: The preoperative staging of lung cancer can be problematical when we attempt to evaluate T factor (T2-T3 versus T4) and N factor (N0 versus N1-N2). In some cases, radiology tests (CT scan, magnetic resonance imaging) cannot entirely dispel the possibility that the mediastinal structures have been infiltrated. N factor ...

D-myo-inositol-1,2,6-triphosphate (1,2,6-IP3) has beneficial effects in experimental, progressive burn-induced ischaemia and oedema. A 1 cm2 full-thickness burn was made in the skin of 20 rats with a hot aluminium rod followed by infusion of 1,2,6-IP3 (60 mg.kg.-1 h-1) or isotonic saline (n = 10 in each group). One hour later ...

Both color Doppler sonography and magnetic resonance are imaging techniques which do not use ionizing radiations, but despite this common feature there remain many differences between them. Thus, color Doppler sonography is a cost-effective technique using mechanical waves and providing real-time images while magnetic resonance imaging is much more expensive, ...

Ultrasound contrast agent is used in color Doppler flow imaging for signal enhancement in perfused vessels. We present our experience with its use in the head and neck area and the results obtained. Up until now, 30 patients with carcinomas of the oral cavity or the maxillary sinus, tumors of ...

Agenesis of the internal carotid artery (ICA) is a rare finding that can lead to the false diagnosis of an ICA occlusion. We present the case of a young woman with agenesis of the left ICA. Diagnosis was made noninvasively by color Doppler imaging (CDI) in combination with high-resolution CT ...

We developed a method of velocity-coded color MR angiography using a color code from the data obtained from velocity-phase images of phase-contrast MR angiography in order to add flow direction information to MR angiograms. Phase-contrast MR angiography with reconstruction of velocity-phase images was performed in 30 patients. Two projection images ...

OBJECTIVE: The value of echo-enhanced color and power Doppler sonography in the evaluation of transjugular intrahepatic portosystemic shunts (TIPS) was assessed and compared with that of unenhanced Doppler sonography and portal angiography. SUBJECTS AND METHODS: In a prospective randomized trial, 31 shunts in 30 patients underwent unenhanced conventional color and ...

OBJECTIVE: To study the ability of a qualitative assessment of the common femoral Doppler waveform to screen for significant aortoiliac disease. DESIGN: Prospective, semi-blind study. SETTING: Vascular laboratory, University Hospital. METHODS: A total of 118 aortoiliac segments were studied in 73 patients. Each aortoiliac segment was graded as normal or ...

Recently, an ultrasound method for vascular applications using the amplitude of the reflected echosignal for the generation of intravascular color signals has been introduced. We compared the utility of this power Doppler imaging (PDI) with conventional color Doppler flow imaging (CDFI) for examination of vertebral arteries (VA). Forty-nine patients with ...

OBJECTIVE: To investigate any systematic differences in the analysis of blood flow velocity waveforms derived by color Doppler imaging and color Doppler energy examination of corpora lutea and adnexal tumors, to test whether the accuracy for diagnosing ovarian malignancy differs between end points derived by color Doppler imaging and color ...

The purpose of this study was to evaluate the accuracy and reliability of duplex Doppler ultrasound (US) and computerized tomography (CT) in staging patients with renal cell carcinoma (RCC). Sixty-six patients were evaluated pre-operatively with duplex Doppler ultrasound and CT. The results were compared with the surgical and histopathological findings. ...

The purpose of this prospective study was to compare the accuracy of B-mode transvaginal ultrasonography alone and in combination with color Doppler energy (or power Doppler) imaging in differentiating benign from malignant adnexal masses. A total of 192 consecutive persistent adnexal masses (159 benign, 33 malignant) were studied before surgery ...

OBJECTIVE: To assess the ability of power Doppler ultrasonography (PDU) to detect acute pyelonephritis and to compare the findings from PDU with those from enhanced computed tomography (CT). PATIENTS AND METHODS: Eleven patients (mean age 18.5 years, range 5-37) admitted to hospital with a clinical diagnosis of pyelonephritis were assessed ...

Antepartum diagnosis of placenta accreta on the scarred myometrium of the isthmus uteri after previous cesarean section was made in 2 pregnancies. Antepartum sonographic examination revealed abnormal bulging of placental tissue toward the bladder cavity and arcuate arteries within the bladder wall. Magnetic resonance imaging revealed the depth and extent ...

Reports on the histological and biochemical nature of periprosthetic fibrous/granulomatous tissue has, to date, been largely limited to frozen tissue sections. This study reports the cytokine and matrix metalloproteinase profiles found in periprosthetic interface tissues in THA which have failed due to aseptic loosening and in capsular tissues obtained at ...

To assess the feasibility and advantages of functional motion-mode (M-mode) sonography in pediatric patients with various non-cardiac M-mode applications, 50 patients aged 6 days to 14.5 years with megaureter, diaphragmatic palsy and spinal cord malformation were studied. In addition to initial conventional brightness-mode gray-scale ultrasound. M-mode sonography was performed for ...

To investigate the velocity profiles and jet sizes of transtricuspid inflow by magnetic resonance imaging (MRI), we examined seven dilated cardiomyopathy (DCM) patients (mean age 37 +/- 15 years) and 20 normal subjects (mean age 32 +/- 7 years). We used a Siemens Magnetom Impact Expert (1.0 T) together with ...

We propose a new definition of the total variation (TV) norm for vector-valued functions that can be applied to restore color and other vector-valued images. The new TV norm has the desirable properties of 1) not penalizing discontinuities (edges) in the image, 2) being rotationally invariant in the image space, ...

BACKGROUND: One of the most difficult problems in the in vivo diagnosis of cutaneous tumors is the differentiation clinically between early malignant melanoma (MM) and atypical (dysplastic) melanocytic nevi (AMNs) because these lesions share clinical features. High-quality digital imaging systems and store-and-forward technology have the potential for use in a ...

The aim of this study was to determine the utility of pulsed Doppler and 2D echocardiography for the detection and the quantification of circulating bubbles after decompression. Twenty-three sport divers performed 60 SCUBA dives (mean 32 msw). An evaluation of circulating bubbles was performed using 2D images one hour after ...

Sixty-nine cases of pseudoaneurysm were made in 72 femoral arteries of 54 Japanese white rabbits, with a successful rate of 95.8%. Colored Doppler's ultrasonic imaging, CT, MRI, arterial angiography, anatomic dissection, and histologic observation were carried out at different times after the operation. The mechanism for the formation of pseudoaneurysm ...

Okinawan sea urchins, the genus Echinometra, are four independent species. But which species are the same species as E. mathaei and E. oblonga as described by is still open to question. To answer this question, a field survey of genus Echinometra was made in Mauritius (the type locality of E. ...

We introduce a representation for color texture using unichrome and opponent features computed from Gabor filter outputs. The unichrome features are computed from the spectral bands independently while the opponent features combine information across different spectral bands at different scales. Opponent features are motivated by color opponent mechanisms in human ...

The ultrasound and color Doppler sonography characteristics of inflammatory pseudotumor (IPT) of the spleen are nonspecific, and thus preoperative diagnosis of the tumor is difficult. We describe a case of IPT of the spleen studied with ultrasound, color Doppler sonography, CT, and MRI, and we report the usefulness of US ...

PURPOSE: To describe the gray-scale and color and duplex Doppler ultrasound (US) and the magnetic resonance (MR) imaging features of uterine arteriovenous malformations (AVMs). MATERIALS AND METHODS: Uterine AVMs in 10 patients were retrospectively evaluated. All patients underwent gray-scale US and color and duplex Doppler US. Nine underwent angiography with ...

Aortopulmonary window was prospectively diagnosed by magnetic resonance imaging in a 9-month-old boy. The diagnosis was confirmed by cardiac catheterization, angiocardiography, two-dimensional and color doppler echocardiography. Spin-echo T1-weighted axial and coronal magnetic resonance images show a large windowlike communication between left ascending aorta and right wall of the main pulmonary ...

OBJECTIVES: Mitral regurgitation (MR) is a common echocardiographic finding; however, there is no simple accurate method for quantification. The aim of this study was to develop an easily measured screening variable for hemodynamically significant MR. BACKGROUND: The added regurgitant volume in MR increases the left atrial to left ventricular gradient, ...

BACKGROUND AND AIMS: The aim of the present study was to compare power Doppler imaging with traditional color Doppler imaging and with contrast enhanced computer tomography in the evaluation of intratumoral vascularity of hepatocellular carcinomas at diagnosis and in response to percutaneous ethanol injection. PATIENTS AND METHODS: Sixteen patients with ...

We report on improved image quality and some recent clinical results with volume-rendered, color composite, multiparameter, magnetic resonance (MR) datasets and their color histograms. In a previous article we demonstrated the major components of an interactive visualization environment for multiparameter T1-, T2-, PD-weighted MR volume datasets. These are compositing of ...

This study was designed to assess color Doppler echocardiographic parameters in subjects with minimal mitral regurgitation (MR) in an otherwise normal heart. Study cases were selected during a five month period from 2500 young males with an echocardiographic indication on the basis of subjects' complaints and physical examination. Left ventriculography ...

PURPOSE: To determine the value of transabdominal ultrasound (US), transvaginal US, color Doppler US, power Doppler US, and magnetic resonance (MR) imaging in the diagnosis of placenta accreta. MATERIALS AND METHODS: Nineteen patients in the third trimester of pregnancy who were at risk for placenta accreta underwent color Doppler and ...

BACKGROUND: This study was a prospective evaluation of colour duplex imaging for the assessment of distal run-off before femorocrural reconstruction. METHODS: Patients with critical ischaemia who required a distal bypass underwent preoperative run-off assessments using dependent Doppler, arteriography and duplex imaging by a vascular surgeon, radiologist and technologist respectively; each ...

BACKGROUND AND PURPOSE: Power Doppler imaging (PDI) is a new sonographic technique that has recently been introduced for vascular application. Since the technical principles of PDI may provide increased sensitivity to visualize the continuity of blood flow in arterial stenoses, we investigated the diagnostic significance of PDI and the intermethod ...

In DDD-pacemaker patients with high degree AV block, Doppler echocardiography of transmitral blood flow can be used to find the individually optimal AV delay (AVO) for left heart AV synchronization. This study tried to validate a Doppler method (ECHO) recently proposed to optimize left ventricular filling by comparing it to ...

To investigate the velocity profiles of transtricuspid inflow, we examined 20 normal subjects (17 males and 3 females, mean age 27 +/- 7) by the magnetic resonance imaging (MRI). Electrocardiographic gating was performed in all anatomical and flow studies, and sequences were triggered by the R wave. Cine gradient echo ...

A 17-year-old woman was admitted because of a liver tumor found incidentally by ultrasonography. Liver function was normal and there were no markers of hepatitis viruses or malignancy. Abdominal ultrasonography, computed tomography (CT), and magnetic resonance imaging revealed a mass (2 cm in diameter) in the lateral segment of the ...

OBJECTIVE: Our purpose was to assess the accuracy of measurements of flow velocity and volume flow rate in an in vitro phantom and in healthy human volunteers using a cardiac-gated, segmented K-space, fast cine phase-contrast (PC) MR imaging technique with view sharing (fast PC). We compared this method with conventional ...

BACKGROUND: Exposure to UV radiation can lead to clinical, histologic, and ultrastructural changes in acquired melanocytic nevi. OBJECTIVE: We investigated whether UVB therapy can induce changes in melanocytic nevi detectable by dermoscopy. METHODS: Eighty acquired melanocytic nevi of 13 patients (10 females, 3 males; mean age, 28 years; range, 13 ...

A 66-year-old male presented with an angiographically occult orbital varix. Angiography and phlebography failed to demonstrate the lesion. Computed tomography angiography showed the varix, but not the vascular flow. Color Doppler flow imaging clearly demonstrated the well-defined varix with slow flow velocity, as well as the precise anatomical location. We ...

RATIONALE AND OBJECTIVES: The appearance of the intracranial vasculature was compared on power and color Doppler ultrasound (US) scans obtained with and without a microbubble contrast agent. MATERIALS AND METHODS: Nine patients (three men, six women) aged 42-70 years (mean age, 53 years) participated in the study. Seven patients underwent ...

This study was undertaken to assess the capabilities of intrauterine ultrasonography performed while inflating the endometrial cavity with fluid and magnetic resonance imaging as a means to assess the depth of myometrial invasion by endometrial cancer preoperatively. Twenty women with endometrial disorders underwent preoperative intrauterine ultrasonography and magnetic resonance imaging. ...

Eight healthy, adult cats were examined with biplane transesophageal echocardiography (TEE). Cats were sedated with a combination of diazepam and propofol and were examined using a 5 mm x 80 cm pediatric biplane TEE probe. Consistent images were obtained at three imaging depths within the esophagus. The caudal position provided ...

The accuracy of color Doppler ultrasonography (CDUS) in diagnosing right hepatic artery (RHA) involvement was preoperatively evaluated in 28 patients with biliary tract cancer. When a tumor partially or completely surrounded the RHA, the circumferential involvement was diagnosed as positive. With B-mode ultrasonography imaging alone in the 10 nonsurgical patients, ...

A moiré pattern color-encoding technique in which a digital image-processing system is used is described. The technique can display color moiré patterns with color sequences that represent the fringe orders. This technique is simple and fast and can be performed automatically. Experimental results demonstrating the feasibility of the technique are ...

The improved depiction of renal parenchymal vascularity with power Doppler imaging facilitates the sonographic detection of hypovascular lesions such as pyelonephritis, renal abscesses, and infarction. However, the finding of diminished or absent lobar perfusion may be present in all of these entities; thus, the abnormalities shown on power Doppler imaging ...

Tissue Doppler imaging displays color-coded myocardial velocity on-line and has potential to objectively quantify regional left ventricular function. Sixty patients, aged 56 +/- 10 years, were studied to determine the normal and abnormal segmental endocardial velocity response to dobutamine stress, and the sensitivity, specificity, and accuracy of tissue Doppler imaging ...

Transcranial Doppler (TCD) and transcranial color-coded duplex sonography (TCCD) are ultrasound neuroimaging modalities that can provide useful diagnostic information on the intracranial vasculature with a high degree of safety. However, the skull can serve as an effective bone barrier, reducing reflected ultrasound signal by up to 100% in some patients ...

OBJECTIVE: To develop a method of quantitating immunohistochemical staining using diaminobenzidine (DAB) and hematoxylin by means of color image analysis. STUDY DESIGN: Red-green-blue (RGB)-filtered grayscale values from images from microscopic slides of mouse jejunum, stained with DAB, hematoxylin or both were analyzed using the public domain program NIH Image. Based ...