Clinical Value Of CT Research Articles

Clinical Value of CT in Diagnosis of Abdominal Infection in Patients with Gastrointestinal Perforation

Clinical Value of CT in Diagnosis of Abdominal Infection in Patients with Gastrointestinal Perforation

Comparison of the clinical value of CT and MRI in the early diagnosis of cerebral infarction

Objective To compare the clinical value of CT and MRI in the early diagnosis of cerebral infarction. Methods 50 patients with cerebral infarction were selected.All patients underwent CT and MRI examination within 6 hours of the onset.The clinical value and diagnostic accuracy of two kinds of examination methods were compared. Results The CT examination diagnosed 8 cases of cerebral infarction, the diagnostic accuracy of CT examination was 16.0%.The MRI diagnosed 48 cases of cerebral infarction, the diagnostic accuracy of MRI examination was 96.0%.The diagnostic accuracy of MRI was significantly higher than CT(χ2=8.019, P<0.05). Conclusion The clinical value of MRI in the early diagnosis of cerebral infarction is higher than CT, it can clearly show the location of lesions, morphology, size, MIR is conducive to the early diagnosis of cerebral infarction and is helpful for clinical treatment in a timely manner. Key words: Tomography, spiral computed; Magnetic resonance imaging; Infarction, middle cerebral artery; Early diagnosis

Clinical value of CT in the diagnosis of localized pancreatitis

Clinical value of CT in the diagnosis of localized pancreatitis

Clinical value of CT combined with ultrasound in diagnosis of malignant bone tumor

Objective To investigate the clinical value of CT scanning combined with ultrasound technique in diagnosis of malignant bone tumor.Methods 100 patients with malignant bone tumor were randomly divided into control group(50 cases with CT scan),and observation group (50 cases received CT scanning combined with ultrasound technology).The diagnostic accuracy rate,tumor bone formation and destruction of bone,periosteal reaction and soft tissue mass were compared between the two groups.All results were judged by the results of MR.Results Diagnostic accuracy rate of the observation group was 80.0％ (40/50),which was significantly higher than 64.0％(32/50) in the control group (x2 =4.65,P ＜ 0.05).In observation group,diagnosis of bone destruction in 60 cases,the tumor bone formation 10cases,83 cases of periosteal reaction and soft tissue mass in 40 cases,those in the control group were 40 cases,5 cases,62 cases,30 cases,the differences between the two groups were statistically significant(x2 =4.86,5.71,6.21,5.22,all P ＜ 0.05).Conclusion The combination of CT and ultrasound in the diagnosis of malignant bone tumors had high diagnostic accuracy rate,and could guide clinical treatment. Key words: Bone neoplasms; Tomography, X-ray computed; Ultrasonography

Clinical value of CT in early diagnosis and treatment of acute abdomen

Clinical value of CT in early diagnosis and treatment of acute abdomen

Clinical value of CT in diagnosis of pulmonary Wegener's graulomatosis

Objective To explore the clinical value of CT in diagnosis of pulmonary Wegener's granulomatosis.Methods The clinical data of 11 cases with Wegener's granulomatosis of the lungs were selected.All patients underwent CT scan or enhanced MRI scans and misdiagnosis of CT images were analyzed.Results This group of patients with bilateral lung injury in 9 cases,unilateral lung injury in 2 cases.Main imaging features include:multiple nodules in 8 cases,irregular flakes consolidation shadow in 4 cases,wedge-shaped lesion in 3 cases,empty in 6 cases.Among 11 patients,8 patients were misdiagnosed,misdiagnosis rate was 72.72％ (8/11),of which 2 cases were misdiagnosed as primary lung cancer,3 cases were misdiagnosed as metastatic lung cancer,3 cases were misdiagnosed as tuberculosis.Conclusion The CT manifestations had a very important role in guiding the diagnosis of pulmonary Wegener's granulomatosis. Key words: Wegener granulomatosis; Lung; Tomography; X-ray computed; Diagnosis; differential

Clinical value of CT in the Diagnosis of The Gastric Carcinom

Objective To explore CT diagnosis of gastric carcinoma.Methods 83 Patients with gastric car-cinoma were checked by CT.Results All cases were confirmed either by pathology or by fiberoptic gastroscope.CT accuracy of determing the nature reached to 93%.Conclusion Early gastric carcinoma cant be discovered by CT u-sually.Proceeding gastric carcinoma can be easily discovered.implemented at ages and classified. Key words: Stomach neoplasms; Tomography,x-ray computed; Diagnosis

The value of CT in the etiological classification of primary aldosteronism

Objective To assess the clinical value of CT in the identification of the etiology of primary aldosteronism(PA).Methods Seventeen cases who underwent both adrenal vein sampling (AVS)and CT examination were retrospectively investigated.By using results of AVS as gold standard.we evaluated CT in the determination of the etiology of(PA).Results Seven cases showed no abnormalities on CT,and six eases exhibited unilateral or bilateral nodules.Enlarged configuration was found bilaterally in 2 cases and unilaterally in one case.and in another case with contralateral nodules.In 15 cases with bilateral adrenal hyperplasia(BAH)pwved by AVS,7 eases had normal CT ima6ng,5 cases showed CT findings consistent with AVS,and 3 cases showed intermediate findings.Conclusion CT imaging is unreliable in the identification of the etiology of PA,especially in the diagnosis of BAH. Key words: Hyperaldosteronism; Tomography,X-ray computed

CT guided radioactive seed (125)I implantation in treating multiple bone metastasis

To investigate the clinical value of CT guided radioactive seed (125)I implantation in treating bone metastasis. 28 multiple bone metastatic tumor patients with 116 metastatic lesions totally, adenocarcinoma of lung in 6 cases, squamous cell carcinoma of lung, renal clear-cell carcinoma, and carcinoma of prostate in 4 cases each, hepatocellular carcinoma and colon carcinoma in 3 cases each, breast carcinoma in 2 cases, and malignant schwannoma and pancreatic cancer in 1 case each, 13 males and 15 females, aged 49.8, underwent CT guided radioactive seed (125)I implantation into bone metastatic lesions. In these 28 cases, complete pain relief (CR) was observed in 16 cases, partial relief (PR) in 7 cases, and no change (NC) in 5 cases with an effective rate of 82.1%. Among the 116 lesions in these 28 cases local control (LC) was seen in 93 cases, NC in 17, and PD in 6. The response rate was 80.2%. CT guided radioactive seed (125)I implantation procedure has good clinical effects in treating bone metastasis with minimal invasive and few complications.

The Use of Computed Tomography in the Diagnosis of Pulmonary Embolism

SummaryComputed tomography (CT) has made its introduction in the diagnostic work‐up for pulmonary embolism (PE) since 1992. Initially only larger thrombi could be visualized, gradually smaller thrombi were also found. This is mainly due to technical development in CT and the introduction of the multidetector CT. Today CT is an integral part of the diagnostic work‐up for PE. In this article an overview is given from the literature from 1998 until 2006 about the performance of CT in the detection of PE, especially regarding the diagnostic accuracy and clinical value of CT in the diagnosis of PE.

Clinical value of CT guided 125^I seeds implantion in the treatment of lung metastasis of nasopharyngeal carcinoma HUANG

Objective To investigate the clinical value of CT guided seeds implantion in the treatment lung metastasis of nasopharyngeal carcinoma. Methods From May 2003 to July 2004, 19 patients with lung metastasis of nasopharyngeal carcinoma treated by CT guided 125^Ⅰ radioactive seeds implantation were enrolled in this study. Under CT guidance,125^Ⅰ seeds were implanted into lung metastasis according to TPS or Halarism＇ s experienced function ： mCi = Da × 5 （ Da means the average of length , width and height of lesion）. The mCi is the total activity of 125^Ⅰ. The number of 125^Ⅰ seeds needed equals to that of total activities divides the activity of single particle. Results All patients received chest CT scan 2 months after the procedure. Among 42 lesions in 19 cases, CR was 23 , PR 9, NC 5 and PD 5. The effective rate was 76. 2%. 5 patients were still alive. The longest survival period was more than one and half year. One year survival rate achieved 57.9%. No severe side effects occurred during the procedure. Conclusion CT guided 125^Ⅰ seeds implantion in the treatment of lung metastasis of nasopharyngeal carcinoma is an effective, microinvasive method with few complications. Key words: Nasopharyngeal carcinona; Lung metastasis; Radioactive seeds implantation

CT guided radioactive seed 125I implantation in treatment of pancreatic cancer

To investigate the clinical value of CT guided radioactive seed (125)I implantation in treatment of pancreatic cancer. Twenty-six patients with pancreatic cancer 6.1 cm in size on average, 21 males and 5 females, aged 60 +/- 13 (47 - 73), underwent CT guided radioactive seed (125)I implantation. Of the 26 patients 15 had the symptom of severer abdominal pain and 10 had jaundice. Three of them were in the TNM (pTNM) stage II, 30 in the stage III, and 3 in the stage IV. Treatment plan system was used to design the distribution of the seed (125)I needed. Under CT guidance, the (125)I seeds of (2.2 - 3.3) Mq were implanted into the pancreatic cancer at a distance of 1.0 - 1.5 cm. A follow-up for 3 - 12 months was conducted. Complete relief (CR) of the symptoms was seen in 9 patients, partial relief (PR) in 2 patients, and no change (NC) in 4 cases with an effective rate of 73.4%. The abdominal pain was relieved 3 - 7 days after the implantation. CT performed 2 months after implantation showed CR in 2 cases, PR in 13 cases, NC in 5 cases, and progression in 5 cases with an overall effective rate of 57.7%. Four patients died of local progression and 2 patients died of distant metastasis. Migration of the seeds into the liver was seen in 3 patients and slight decrease of white blood cells was seen in 1 patient during the 2-month follow-up. No severe complications, such as pancreatic leakage, acute pancreatitis, intestinal hemorrhage, etc, were found. Safe and with minimal damage and few complications, CT guided radioactive seed (125)I implantation is effective in treatment of pancreatic cancer.

National Conference on Dose Reduction in CT, with an Emphasis on Pediatric Patients

321 he clinical value of CT is unquestioned, and the uses of newer helical and multidetector units are growing. The dose received by some patients, particularly children, is higher than desired and must and can be reduced without any significant loss of diagnostic information. These were the conclusions of a 2-day symposium on the subject of CT dose conducted November 6–7, 2002, by the National Council on Radiation Protection and Measurements. CT dose reduction will require a combination of approaches, a series of speakers agreed. These include user education for physicians and radiologic technologists, development of technique charts by medical physicists, development of automatic exposure control devices by manufacturers, and possible retrofits of these devices for older machines. It also will require creation of a climate of opinion in which radiologists will demand attention to dose reduction in their purchase of new CT scanners, one industry participant commented. The National Council on Radiation Protection and Measurements conference was more a work in progress than a starting call to action, said the conference chairman, Fred A. Mettler, Jr., of the University of New Mexico at Albuquerque. He observed that articles about excessive CT dose have multiplied in the radiologic literature and presentations on the subject have appeared on national society programs during the past year. The American College of Radiology (ACR) has announced a new CT facility accreditation program. “Our task is to define where we are on CT dose and to make recommendations on where we go from here.”