Objective: We conducted a multicenter study aimed to determine the sensitivity and the specificity of clinical signs of bronchiectasis in comparison with high-resolution computed tomography (HRCT) findings. Subject and method: 82 patients (60 males and 22 females) with clinical symptoms and chest X-rays findings of bronchiectasis. All participants underwent HRCT with 1-2 mm collimation. The clinical signs of bronchiectasis were correlated with findings on the HCRT imaging, the sensitivity (Se) and the specificity (Sp) of each method were calculated. Results: HRCT findings showed that the simple bronchiectasis occupied in 39% and combined with emphysema in 61% of cases. All patients had symptoms of bronchiectasis, included cough with sputum in 82% (Se 97.5%, Sp 16.6%); hemoptisis in 52.80% (Se 65.8%, Sp 85.3%); dysapnea 28.1% (Se 33%, Sp 72%); chest pain 33.70% (Se 33%, Sp 8.5%). The combination of crackle, rhonchus and wheeze in 28% patients produced Se (35.6%) and Sp (87.8%) higher than that of other authors. This related to bronchiectasis in patients with chronic obstructive pulmonary disease in our group study. Conclusion: The abnormalities revealed by HRCT produced the sensitivity of 98% and the specificity of 99% in bronchiectasis diagnosis, so HRCT seems to be very useful for evaluate bronchiectasis.
diagnosis ; Tomography Scanners ; X-Ray Computed

39 patients with the clinical feature, X-ray and respiratory functional test suggested the bronchodilatation and alveolar dilatation received the spiral CT scanner with the high resolution. The results found that the spiral CT scanner with high resolution allowed evaluating the diffusion level and bronchial lumen and the wall of brachial as well as surrounding alveolus. The spiral CT scanner with the high resolution in the diagnosis of bronchodilation has a high sensitivity (91%) and the specificity (100%) comparing with the standard lung X-ray and conventional CT scanner.
Tomography Scanners ; X-Ray Computed ; diagnosis

Thirty patients who have vertebral from February 1998 to December 2000 were selected in our study group. The average age of these patients is 36 years old (from 12 to 63). The proportion of vertebral trauma is very high (83.33%). Most patients have uninvertebral lesions and multiple vertebral lesions in succession. On CT scanner images traumatic lesions are fracture and dislocation of the vertebral column. Spinal compression is the symptom that is valuable in diagnosis and indication of operations.
Spinal Injuries ; Tomography Scanners, X-Ray Computed

39 patients participated to a study on efficacy of CT scanner combined with the mediastinal insufflation. The results have shown that the images of CT scanner of 30 among 39 these participants were suitable with the total images of the postoperative thymus. The unclear edge of the thymus due to adherence with surround tissue, hypertrophy in a pole, heterogeneous opacity, the density: higher zero (hounsfield unit). The technique of insufflation was simple and little complications. Only insufflation of 200 cm3 gave the clear image in CT scanner.
Thymus Neoplasms ; Tomography Scanners, X-Ray Computed

The authors determined the length, width and depth of thyroid lobe and thyroid volume by computer tomography (CT). Results: there was no statistically significant difference in the width of right lobe with that that of left one (p>0.05), but the length and depth of right lobe is higher than those of left one (p<0.05). There was no statistically significant difference in the volume between two lobes as well as between male and female (p>0.05), but in general the volume of right lobe is higher than that of left one.
Thyroid Gland ; Tomography Scanners, X-Ray Computed

This study measured the size and volume of thyroid by ultrasound and CT scanner. The results have shown that the volume of thyroid in normal people measured by ultrasound was 13,02+/- 4,25 ml(male) and 11,36+/- 3,73 (female). Most of people had size of right lobe of thyroid larger than left lobe. The volume of thyroid measured by ultrasound increased 8,5% (male) and 13,1%(female) when comparing with these measured by CT scanner.
Thyroid Gland ; Tomography Scanners, X-Ray Computed

In this study, we evaluated the dose response of MAGAT (Methacrylic Acid Gelatin gel and THPC) normoxic polymer gel dosimeters based on the X-ray CT scanner. To perform this study, we determined the proper ratio of the gel composition and acquired X-ray scan parameters. MAGAT gel dosimeters were manufactured using MAA (MethacrylicAcid) and gelatin of various concentration, irradiated up to 20 Gy. We obtained the 20 CT images from the irradiated gel dosimeters by using on a Phillips Brilliance Big Bore CT scanner with the various scan parameters. This CT images were used to determine the N(CT)-dose response, dose sensitivity and dose resolution As an amount of MAA and gelatin were increase, the slope and intercept were increase in each MAGAT gel dosimeter with various concentration of the N(CT)-dose response curve. The dose sensitivity was 0.38+/-0.08 to 0.859+/-0.1 and increased were amount of the MAA was increased or the gelatin was decreased. However, the change of gelatin concentration was very small compare to MAA. The Dose resolution (D(delta)(95%)) varies considerably from 2.6 to 6 Gy, dependent on dose resolution and CT image noise. The slope and dose sensitivity was almost ident verywith the variation of the tube voltage, tube current and slice thickness in the dose response curve, but the noise (standard deviation of averamalg CT number) was decreased when the tube voltage, tube current and slice thickness are increase. The optimal MAGAT polymer gel dosimeter based on the CT were evaluated to determine the CT imaging scan parameters of the maximum tube voltage, tube current and slice thickness (commonly used in clinical) using the composition ratio of a 9% MAA, 8% gelatin and 83% water. This study could get proper composition ratio and scan parameter evaluating dose response of MAGAT normoxic polymer gel dosimeter using CT scanner.
Gelatin ; Noise ; Polymers ; Tomography Scanners, X-Ray Computed ; Water

Study on 73 fourth ventricle tumors that were operated at Cho Ray hospital, from May 2000 to October 2003. The results: tumors were seen in both children and adults, in male more than female at the ages ranging from 2 years old to 64 years old. The most common age group were 1-10 years (52%), then 11-20 years old (21.9%). In fourth ventricle tumors, the median duration of symptoms prior to radiological diagnosis was 6 weeks. The patients experienced symptoms such as headache, vomitting, vertigo. The common syndromes were: raised intracranial pressure syndrome, cerebellar syndrome, pyramidal syndrome and epilepsy. Brain CT scan, absence of cysts and calcifications, homogeneous hyperdensity favor the diagnosis of medulloblastoma. Ependymomas were typically nonhomogeneous hyperdensity, calcified. Astrocytomas showed nonhomogenous hyperdensity and minimal calcification. Most of cases had ventricular dilatation
Cerebral Ventricle Neoplasms ; diagnosis ; Tomography Scanners, X-Ray Computed

The study was performed on 41 patients using concurrently ultrasound and CT scanner. They were diagnosed surgically and by blood amylase quantified 3 fold higher than normal subjects. Kappa’s indicators were applied for evaluating the concord between ultrasound and CT scanned images. Results showed that both methods of diagnosis were effective for identification and monitoring acute inflammation of the pancrea. In the prognosis, CT scanning is great advantage, especially in necrosis of the parenchyme. Both were limited on the detection of hemorrhagic form of micronecrosis.
Diagnosis ; pancreatitis ; ultrasonography ; Tomography Scanners, X-Ray Computed

Based on CT features of 45 patients (42 males, 3 females) with esophageal carcinoma at Viet Duc hospital from August 2003 to August 2004. Comparison between CT features and operation findings showed that 53.3% of lesions were at the middle and 35.6% were at the lower third of the esophageal. Esophageal wall thicken lesions more than 10 mm, homogenously structures and highly contrast enhancement were the common CT findings in these patients. Otherwise, helical CT Scan could be effective in detection of tracheo-bronchial, aortic, pleural and pericardial infiltration. CT could play an important role in lesion stages and therefore, provide important signs to determine surgical planning.
Esophageal Neoplasms ; Diagnosis ; Tomography Scanners, X-Ray Computed