Tomography, Spiral Computed (Total 494602 Papers Found)

BACKGROUND Several nucleic acid amplification tests (NAATs) are US Food and Drug Administration-cleared for detecting urogenital Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (GC) infection, but they have not been adequately evaluated for the relatively common oropharyngeal or rectal CT and GC infections in men who have sex with men (MSM). METHODS Multiple swabs were collected from the oropharynx and rectum of MSM attending a city sexually transmitted disease clinic. The specimens were ...
The trend in development of X-ray computed tomography systems over the past decade has been toward faster and faster scanners, with comcomitant improvement in image quality. The preliminary results from the DSR scanner suggest the advent of two new, powerful dimensions in X-ray computed tomography¿high temporal resolution and synchronous volume scanning. That is, true stop-action, full three-dimensional imaging at a high repetition rate is possible with CT scanners. Such capabilities promise to ...
BACKGROUND Accuracy of (18)F-fluorodeoxyglucose positron emission tomography (FDG-PET) and contribution to surgical decision making in recurrent or metastatic colorectal cancer were evaluated. METHODS One hundred whole-body PET tests in colorectal cancer patients (1994 to 1998) were compared with computed tomography (CT), liver ultrasonography, and carcinoembryonic antigen (CEA) test. Mean follow-up was 12 months. RESULTS Sensitivity, specificity, and accuracy of FDG-PET for malignant findin ...
18F-Fluorocholine (FCH) and 11C-acetate (ACE) PET are widely used for detection of recurrent prostate cancer (PC). We present the first results of a comparative, prospective PET/CT study of both tracers evaluated in the same patients presenting with recurrence and low PSA to compare the diagnostic information provided by the two tracers. The study group comprised 23 patients studied for a rising PSA level after radical prostatectomy (RP, 7 patients, PSA ≤3 ng/ml), curative radiotherapy (RT, 7 ...
OBJECTIVE To prospectively evaluate the relationship between the early computerized tomography (CT) features of disk herniation and the clinical outcome in patients with recent-onset sciatic or femoral neuralgia treated conservatively. Early CT is often used, despite the absence of data on usefulness for predicting outcomes. METHODS Of 78 patients with sciatica or femoral neuralgia of less than 1 month's duration, presumably due to a disk herniation, 75 were found by CT to have a disk herniati ...
The histopathology of the temporal bones of a patient who died of unrelated causes 10 weeks following cochlear implantation using a Richards Ineraid device is presented. Deafness was caused by a prolonged course of intravenous gentamycin therapy 5 years prior to implantation. The electrode array of the cochlear implant was left in situ throughout histologic preparation and sectioning. Despite displacement and disruption of supporting structures of the inner ear, particularly in the 6-to-15-mm ra ...
OBJECTIVE The objective of this study was to compare the capability of arterial, portal venous, and delayed phases of helical CT with that of iodized-oil CT for revealing nodular hepatocellular carcinomas. MATERIALS AND METHODS Forty-eight patients with nodular hepatocellular carcinomas underwent triphasic helical CT examination with 10-mm collimation at 10-mm/sec table speed. We injected 120 ml of contrast material (36 g of iodine) at the rate of 3 ml/sec. Arterial-phase, portal venous-phase, ...
Objectives. To describe the radiological features of primitive neuroectodermal tumour (PNET) of the chest wall (Askin tumour) at diagnosis and to analyse the radiological changes occurring as a consequence of treatment and during follow-up. Materials and methods. Nine children with histologically proven PNET were studied. At diagnosis, all patients underwent chest X-ray (CXR), chest CT and bone scintigraphy; three patients also had MR and three had US. During treatment and follow-up, CT was perf ...
Invasive tracheobronchial aspergillosis that is entirely limited or predominantly confined to tracheobronchial lesions is a relatively rare form of invasive pulmonary aspergillosis. Extended parenchymal opacities that are radiological manifestations of invasive aspergillosis sometimes occur following invasive tracheobronchial aspergillosis. However, it remains unclear whether or not invasive tracheobronchial aspergillosis is the initial stage of invasive pulmonary aspergillosis. A 61-year-old wo ...
Introduction: Adenocarcinoma of the vermiform appendix is a rare neoplasm of the gastrointestinal tract. Presentation mimics acute appendicitis, but right iliac fossa mass and intestinal obstruction have also been reported. These presentations reflect various stages of a locally expanding tumour causing luminal obstruction of appendix. Most of them are found accidentally on appendicectomies performed for appendicitis. Adenocarcinomas of appendix are only 0.08% of all cancers and the treatment re ...
PURPOSE To evaluate the impact of cone-beam computed tomography (CT) during sclerotherapy of low-flow vascular malformations. MATERIALS AND METHODS Eighty-seven cone-beam CT examinations were acquired during 81 sclerotherapy treatments of low-flow malformations in 48 patients: 81 were performed to evaluate sclerosing agent diffusion and six were performed to evaluate needle or catheter positioning before injection of therapeutic agent. Image quality was rated by two observers. Clinical impact ...
Multiple myeloma (MM) is a very radiosensitive tumor. Fractionated external beam radiation, which takes approximately 2 weeks of therapy, is typically used to irradiate myelomatous bone lesions with the goal of palliation. However, traditional radiotherapeutic techniques are not only lengthy but they also involve a considerable amount of healthy bone marrow in the treatment ports, which may undermine the total marrow reserve of a patient. Because of the limited survival time of patients with met ...
Decidual and intramyometrial spiral arteries from 18 insulin-dependent diabetic and 18 non-diabetic women were compared histologically. All women were normotensive and none had signs of pre-eclampsia. None of the infants in either group had intra-uterine growth retardation. Metabolic control in the diabetic women was assessed by pregnancy glucose level from the last trimester of pregnancy and by C-peptide in amniotic fluid and cord blood as a measure of the fetal beta-cell function. The intramyo ...
BACKGROUND Merkel cell carcinoma (MCC) is a rare neuroendocrine skin tumor, which may be related to sun exposure. It can metastasize to lungs, liver and bone, leading to severe morbidity and mortality. Vertebral metastases from MCC are rare. The authors report the tenth case in the literature, a 59-year-old patient with MCC, which was primarily localized in the scalp, and later provoked distant metastasis to the thoracic spinal column. CASE DESCRIPTION A 59-year-old woman was admitted at our U ...
BACKGROUND Impact of non-pharmacological innovations on cancer cure rates is difficult to assess. It remains unclear, whether outcome improves with 2- [18-F]-fluoro-2-deoxyglucose-positron emission tomography and integrated computer tomography (PET/CT) and intensity-modulated radiotherapy (IMRT) for curative treatment of advanced pharyngeal carcinoma. PATIENTS AND METHODS Forty five patients with stage IVA oro- or hypopharyngeal carcinoma were staged with an integrated PET/CT and treated with ...
  • Shi Wen Li,
  • Zhonghua shen jing jing shen ke za zhi = Chinese journal of neurology and psychiatry
  • 1990
The myelographic results of 30 cases in each group using myodil and omnipaque respectively were compared. As far as intraspinal extramedullary lesions were concerned, the diagnostic value of either contrast medium was almost the same. If CT scan was used along with omnipaque myelography, the fine structural changes could better be observed. As to the intramedullary lesions of the spinal cord, both contrast media seemed to be of less diagnostic value even though CT scan was used together. This wa ...
The kidney is a frequent site of involvement in lymphoproliferative disorders. The aim of this study was to demonstrate the prevalence and spectrum of morphologic appearances of renal involvement in patients with lymphoma on helical computed tomographic (CT) scan. Three phases of post-contrast helical CT of the abdomen in 74 patients with lymphoma were reviewed for possible renal involvement: the cortico-medullary, nephrographic and delayed excretory phases. Tumor characteristics, patterns of di ...
OBJECTIVE To determine if physical examination (PE) of the posterior pelvis in awake and alert trauma patients with known pelvic ring injuries can accurately predict a potentially unstable posterior ring injury and guide the use of computed tomography (CT) more effectively. DESIGN Patients with pelvic fracture noted on anteroposterior (AP) pelvic radiographs were prospectively evaluated over a 21-month period. AP, inlet, and outlet radiographs as well as CT scans were obtained on all patients. ...
Purpose: The aim of the study was to determine whether fixed orthodontic appliances cause root and alveolar bone resorption and to compare the precision of orthopantomography and computerized tomography in detection of resorption process. Methods: Eighty-five patients scheduled for orthodontic therapy with fixed appliances were included in prospective self-controlled study. Before and after orthodontic treatment orthopantomography was done for all patients and thirty-five patients were sent to C ...
Sir, The clivus is one of the common sites for diverse pathological lesions. 1 Tuberculosis commonly involves the craniovertebral junction causing atlanto-axial dislocation. However, primary skull base tuberculoma is extremely rare. A case of primary spheno-clival tuberculoma without involvement of the craniovertebral junction is reported and the management is discussed. A 24-year-old, non-immunocompromised lady presented with history of progressive diplopia and inward deviation of both eyes for ...
BACKGROUND Pleural effusions in respiratory intensive care unit (RICU) are associated with diseases of varied etiologies and often carry a grave prognosis. This prospective study was conducted to establish an etiologic diagnosis in a series of such patients before starting treatment. MATERIALS AND METHODS Fifty consecutive patients, diagnosed with pleural effusion on admission or during their stay in RICU, were further investigated by a two-step approach. (1) Etiologic diagnosis was establishe ...
BACKGROUND Coronary artery calcification (CAC) is correlated with aortic calcification (AC) and predicts coronary atherosclerosis as well as obstructive coronary artery disease (OCAD). This study aims to investigate whether AC predicts OCAD independent of CAC and its incremental value in predicting OCAD with CAC. METHODS Among the consecutive patients who underwent 64-slice multidetector CT (MDCT), we enrolled 120 stable OCAD (luminal narrowing ≥ 50%) patients and 120 controls without OCAD, ...
OBJECTIVES The aims of the study were the following: (1) to determine how often computed tomography (CT) scans of the head are obtained on rapid responses called for altered mental status (AMS), (2) to determine whether CT imaging of the head is required during all rapid responses called for AMS, (3) to determine which patients would benefit from CT scans of the head in this setting, (4) to note whether an adequate neurologic exam was documented, (5) to determine the cost of CT scans that did no ...
The role of multi-detector-row computed tomographic angiography (MDCTA) in spinal vascular malformations has not yet been determined. We present a report on a short series of spinal arteriovenous fistulae (AVF) evaluated by MDCTA. With 4-row and 16-row MDCTA, three cases of spinal dural AVF and one case of perimedullary AVF were examined. Each case was also examined by magnetic resonance (MR) imaging and spinal catheter angiography. In two patients with spinal dural AVF, including one patient wi ...
Osteoid osteoma is a benign bone tumor that generally presents with nighttime pain among young adults and is relieved by rest and salicylates. It can affect any bone, but occurrences in the iliac are unusual. The authors describe two cases of intramedullary osteoid osteoma next to the sacroiliac joint, with symptoms that simulated sciatic pain. The cases were diagnosed late, although the initial radiographs showed sclerotic lesions in both cases. The diagnosis was confirmed by means of CT scan a ...
The current medical system provides medical services to patients who visit hospitals. However, medical services can be provided at or close to the home of the patient using fully-equipped mobile telemedicine systems. Such a system can identify diseases at an early stage, improve the patient's quality of life and prognosis through early diagnosis and treatment, and reduce the cost of the medical service. Furthermore, the unit can provide mass screenings of the population, as well as a full medica ...
We studied 8 patients with cerebral infarction in the deep territory of the middle cerebral artery (MCA). All patients had a definite cardiac source of emboli and no known factors for thrombosis. Mixed sensory and motor deficit was found in all but one patient and CT scan showed larger lesions than usually reported in lacunar infarcts. Contrast enhancement was seen in all cases in which CT scan was performed in the second or third week. It is concluded that embolic infarcts in deep cerebral terr ...
BACKGROUND Material decomposition of dual-energy computed tomography (DECT) enables subtraction of calcified plaque. PURPOSE To evaluate the accuracy of lumen area measurement in calcified plaque by subtraction of DECT and to determine the effect of contrast material concentration, lumen diameter, density, and thickness of calcified plaque for the measurement. MATERIAL AND METHODS Vessel phantoms were made with six lumen diameters (5.7, 4.9, 3.9, 3.0, 1.9, and 1.3 mm) and six types of calc ...
BACKGROUND & OBJECTIVE Lung is the most common organ to which liver cancer cells transfer. For the patients only with lung metastases whose primary liver cancers were in good control, treatment efficacy on lung metastasis is a crucial prognosis factor. This study was to evaluate the efficacy of CT-guided intra-tumoral dehydrated ethanol injection on lung metastasis from liver cancer. METHODS From Aug. 2004 to Sep. 2006, 17 patients with 37 lung metastatic lesions, whose primary liver cancers w ...
The purpose of this study was to investigate the diagnostic accuracy of low-dose helical computed tomography by comparing the number of nodules detected at low- and standard-dose CT. The prospective study included 25 patients who were referred to CT scan for the assessment of pulmonary metastases. All patients underwent CT examinations at both standard- (200 mA, 120 kV, collimation 5 mm, table feed 10 mm per rotation) and low-dose (50 mA, 120 kV, collimation 5 mm, table feed 10 mm per ro ...
The edifice of peer-reviewed literature, particularly in neuroradiology, has new technology as one of its major building blocks. Indeed, one of the easiest paths to publication is the application of a new technological “toy” to a neurodiagnostic problem, or a refinement of that toy to allow a new application (take if from one with shameless experience). For example, with each new iteration of technology, a large number of articles dealing with the pituitary gland has been republished, someti ...
Abdominal aortic aneurysm (AAA) is a local, progressive dilation of the distal aorta that risks rupture until treated. Using the law of Laplace, in vivo assessment of AAA surface geometry could identify regions of high wall tensions as well as provide critical dimensional and shape data for customized endoluminal stent grafts. In this study, six patients with AAA underwent spiral computed tomography imaging and the inner wall of each AAA was identified, digitized, and reconstructed. A biquadric ...
OBJECTIVE An additional case of testicular Leydig cell tumor in a young man is reported. The clinical presentation included gynecomastia and a testicular mass. METHODS/RESULTS Hormonal studies, testicular US and high resolution MRI were performed before orchidectomy. The histopathological findings were consistent with Leydig cell tumor. A CT scan revealed no metastasis. The patient is clinically disease-free 18 months after orchidectomy. CONCLUSION High resolution MRI must be performed only ...
PURPOSE To study the effect of intraoperative mitomycin C (MMC) in external dacryocystorhinostomy (DCR), on the clinical evolution and osteotomy size with helical computed tomography (HCT). METHODS A total of 17 patients who had undergone DCR were randomly assigned to either a control group (8 patients) or an MMC group (9 patients). Intraoperative MMC (0.2 mg/ml/2 minutes) was applied to the osteotomy site. HCT scans were performed within 24 hours after surgery and then at 1, 3 and 6 months. T ...
onds, albumin 3.8 gm/dL, and normal liver function tests. She was admitted to the intensive care unit for further management. An upper GI endoscopy was performed, which revealed normal esophagus, large hiatus hernia, and normal stomach and duodenum. Upon withdrawing the gastroscope while examining the hypopharynx and oropharynx, a large varix was noticeable in the oropharynx, with stigmata of a recent bleed (Fig. 1). The next day, her Hb was 6.9 without any further evidence of active bleeding. S ...
BACKGROUND Image-guided pleural biopsies, both using ultrasound (US) or computed tomography (CT), are important in the diagnosis of pleural disease. However, no consensus exists regarding which biopsy needles are appropriate for specific procedures. OBJECTIVES In this randomized, prospective study, we aimed to compare CT scan-guided pleural biopsy using an Abrams' needle (CT-ANPB) with US-assisted pleural biopsy using a cutting needle (US-CNPB) with respect to both diagnostic yield and safety. ...
BACKGROUND Questions abound regarding natural history and medicolegal implications of untreated peroneal tendon dislocation (PTD) associated with calcaneal fractures. METHODS We retrospectively analyzed CT scans and anteroposterior ankle radiographs of 79 consecutive calcaneal fractures presenting over 4 years at a single institution. RESULTS Nineteen patients (24%) had associated PTD, which was initially missed in 10 (53%). Bony fleck was present in 11 (13.75%). Soft tissue swelling at late ...
PURPOSE F-fluorothymidine (FLT), unlike FDG, is incorporated exclusively into DNA and is considered a specific marker of cell proliferation. The role of FLT PET/CT scan in differentiating benign from malignant pancreatobiliary tumors is unknown. PATIENTS AND METHODS Twenty-five suspected pancreatobiliary tumors on contrast-enhanced CT (CECT) scan in 23 patients were evaluated by FDG PET/CT and FLT PET/CT scans. The histopathology or fine-needle aspiration cytology was considered as criterion s ...
Generation of finite element (FE) meshes of vertebrae from computed tomography (CT) scans is labour intensive due to their geometric complexity. As such, techniques that simplify creation of meshes of vertebrae are needed to make FE analysis feasible for large studies and clinical applications. Techniques to obtain a geometric representation of bone contours from CT scans of vertebrae and construct a hexahedral mesh from the contours were developed. An automated edge detection technique was deve ...
A 36 year-old female was pointed out of pulmonary abnormal shadows in the annual chest survey. Chest radiograph and computed tomography (CT) disclosed bilateral diffuse infiltrative shadows and tree-in-bud appearance in the right upper lung field and the left lingula. A sputum smear for acid-fast bacilli was negative. Histopathologically, the transbronchial lung biopsy specimen revealed non-caseous epithelioid granulomas with numerous giant cells. Acid-fast bacilli were cultured from her sputum, ...
In adenocarcinoma of the esophagus and esophagogastric junction for prognostication and treatment allocation, one prerequisite is accurate pretreatment staging. This staging, we hypothesized, would be improved by the use of positron emission tomography (PET). After 55 patients suitable for radical esophageal resection were staged with PET, spiral computed tomography (CT), and endoscopic ultrasonography (EUS), results were compared with histopathology and with survival. Accuracy in detecting loco ...
AIM To investigate the correlation between microvessel density and spiral CT perfusion imaging in colorectal carcinoma. METHODS Thirty-seven patients, with histologically proven colorectal carcinoma, underwent water enema spiral CT scan. The largest axial surface of the primary tumor was searched on unenhanced spiral CT images. At this level, the enhanced dynamic scan series was acquired. Time-density curves (TDC) were created from the region of interest drawn over the tumor, target artery by ...
OBJECTIVE To compare the probability of cancer in a solitary pulmonary nodule using standard criteria with Bayesian analysis and result of 2-[F-18] fluoro-2-deoxy-D-glucose-positron emission tomographic (FDG-PET) scan. SETTING A university hospital and a teaching Veteran Affairs Medical Center. METHODS Retrospective analysis of 52 patients who had undergone both CT scan of the chest and a FDG-PET scan for evaluation of a solitary pulmonary nodule. FDG-PET scan was classified as abnormal or n ...
INTRODUCTION Thoracic injury and its complications are responsible for as much as 25% for blunt trauma mortality. Pulmonary contusion occurs in 30%-75% of these cases. Despite advances in pulmonary care and intensive care management pulmonary contusion still contributes to higher mortality and morbidity for patients with severe injuries. AIM To assess the outcome of pulmonary contusions in patients with chest trauma and various factors determining mortality in these patients. MATERIALS AND M ...
This essay illustrates the findings obtained with spiral CT imaging in pancreatic disease. Features of spiral CT--fast scanning, dynamic injection of contrast material allowing optimal vessel opacification, and supplemental multiplanar imaging--promise to provide increased accuracy in the diagnosis and staging of pancreatic disease. With further development of continuous (spiral/helical) scanning technology, this technology should expand to cover a wider range of applications. ...
It is generally assumed that at least a minimal number of spiral ganglion cells is essential for successful speech perception with a cochlear implant. Although the insertion of a multichannel cochlear implant frequently results in loss of residual hearing in the implanted ear, this outcome does not imply that significant damage to residual populations of spiral ganglion cells has occurred. The purpose of the current study was to compare spiral ganglion cell counts in implanted and nonimplanted c ...
BACKGROUND AND PURPOSE The planning process in radiotherapy (RT) typically involves the acquisition of a unique set of CT images - and eventually of functional images - which is used for delineation of target volumes (TV) and organs at risk (OAR) and for dose calculation. Restricting the delineation and dose calculation solely on pre-treatment images is an oversimplification as it is only a snapshot of the patient's anatomy. The objectives of the present study were (1) to assess the consequences ...
PURPOSE To determine effective radiation dose to patients during needle interventions with cone-beam computed tomography (CT) guidance and compare it with the dose during conventional CT-guided interventions. MATERIALS AND METHODS Cone-beam CT guidance is a recently developed technique with image acquisition on a flat-panel detector digital angiography system. It is based on a combination of acquired three-dimensional soft-tissue cone-beam CT, dedicated needle trajectory software, and fluorosc ...
OBJECTIVE In most institutions, a combination of unenhanced and contrast-enhanced CT is used to screen patients for suspected hypervascular hepatic neoplasms. Elimination of the unenhanced examination could save time and expense and reduce the patient's exposure to radiation. We compared unenhanced and incremental bolus dynamic contrast-enhanced CT for detection of hypervascular hepatic neoplasms and evaluated the need for preliminary unenhanced hepatic CT. SUBJECTS AND METHODS We prospectivel ...