PURPOSE: Magnetization transfer imaging(MTI) is a new imaging contrast technique. Our MT pulse sequence is designed as fixed time interval between echo and MT pulse. This study was peformed to evaluate the influence of variations in TR/TE on MTR in T1 weighted image of normal brain tissue on this kind of MT pulse sequence. MATERIALS AND METHODS: Seven healthy volunteers in twenties of age as the objectives, MRI was taken under various TR/TE(TR/TE ;700/14, 650/14, 750/14, 700/20 and 1500/20 msec). MTR was calculated from signal intensities measured at the same point in both pre and post MT images and statisticslly analyzed. The MR imager used in this study was 1.0T Magnetom 42SP(Siemens, Erlangen, Germany) and the parameters of additional MT pulse sequence were offset 1000Hz and bandwidth 250Hz, and posteriorly located to echo with 7.7 msec fixed interval. Offset of this MT pulse was variable. RESULT: In white matter of brain tissue from a normal person, MTR was 34-39%(average 37%) for TR and TE of 700/14 in T1WI and 33-36%(average 35%) for TR/TE of 650/14, and 34-38%(average 35%) for TR/TE of 750/14 which showed no statistical difference. However, in case of 1500/20 of TR/TE, MTR was 26-28%(average 26%) which is statistically significant. With TR/TE of 700/14 as the standrd value, the MTR of gray and white matter were 37% and 29% respectively, showing a definite difference of statistical means. Signal from CSF in ventricles is rarely influenced by MT pulse. CONCLUSION: Conclusively, a subtle variation in TR/TE in T1WI has little influence on MTR but wide range of variation in TR/TE as in proton density image induces significant difference in MTR on this kind of MT pulse sequence. Therefore, the exchangeable usage of MTR data would be possible in narrow range of TR/TE change but difficult in wide range of variation.
Brain* ; Healthy Volunteers ; Humans ; Magnetic Resonance Imaging ; Protons ; Reference Values*

PURPOSE: To obtain magnetization transfer ratio(MTR) of the annulus fibrosus and nucleus pulposus and to assess the feasibility of utilizing the changes of these MTRs as an early indicator of disk degeneration. MATERIALS AND METHODS: MR images of lumbar spine with magnetization transfer(MT) technique in 42 patients were obtained. spin echo techniques (600/14) with same TR/TE with 1KHz off-resonance saturation were employed in 1.0T MR system. MTRs were calculated in two regions, anterior annulus fibrosus and nucleus pulposus, and the results were compared between the normal and degenerative disks, from grade I to IV, on T2-weighted images. RESULTS: MTRs of the nucleus pulposus were 17.6% in the normal disks, and 26.7%, 28.4%, 29.1%, 29.7% in degenerative disks, from grade I to IV, respectively, with a significant difference(P<0.05). On the other hand, MTRs in the annulus fibrosus were 30.2% in the normal disks and 31.5%, 33.2%, 32.1% and 35.6% in degenerative disks, from grade I to IV, respectively, without significant difference. CONCLUSION: Since MTRs are significantly higher in degenerative nucleus pulposus than those of the normal disks, increased MTRs in the nucleus pulposus can be used as an early sign of the degeneration of the nucleus pulposus.
Hand ; Humans ; Intervertebral Disc Degeneration* ; Magnetic Resonance Imaging* ; Spine

BACKGROUND: With the recent development in arterial reconstructive procedure such as percutaneous transluminal coronary angioplasty or atherectomy, the incidence of vascular complications involving femoral artery is increasing due to greater use of larger percutaneous instruments(including arterial sheath) and periprocedural anticoagulant therapy. Femoral pseudoaneurysm requires rapid diagnosis and management to prevent limb ischemia, worsening of the arterial injury or repair of the arterial defect. Recently, accurate diagnosis of these injuries can be made nonivasively with duplex sonography and Doppler color flow imaging, and nonsurgical treatment may be possible by using external compression guided by ultrasound even in patients requiring prolonged anticoagulant therapy. METHOD: Three patients, one undergoing coronary angiography and two undergoing percutaneous transluminal coronary angioplasty, developed expansile groin masses at the vascular access sites diagnosed as femoral artery pseudoaneurysm s by Doppler ultrasound. All patients were hypertensives, taking aspirin and two patients who underwent PTCA received intravenous heparin after procedure. After diagnosis of femoral pseudoaneurysm, all patients underwent mechanical(C-clamp) external compression guided by ultrasound for 3 hours. RESULT: Follow up color flow scans were obtained after 24 hours and in one patients, blood flow in the tract was eliminated but persistent blood flow was observed in two patients who underwent PTCA. Before closure of pseudoaneurysm, one patient needed another 6 hours of ultrasound guided compression and the other needed more 12 hours. All patients were discharged without complication or recurrence of pseudoaneurysm. CONCLUSION: These cases suggest that nonsurgical closure of femoral pseudoaneurysms is feasible even in patients requiring prolonged antiplatelet and anticoagulant therapy.
Aneurysm, False* ; Angioplasty, Balloon, Coronary ; Aspirin ; Atherectomy ; Cardiac Catheterization* ; Cardiac Catheters* ; Coronary Angiography ; Diagnosis ; Extremities ; Femoral Artery ; Follow-Up Studies ; Groin ; Heparin ; Humans ; Incidence ; Ischemia ; Recurrence ; Ultrasonography

No abstract available.
Dermoscopy ; Hemangioma* ; Lasers, Dye

No abstract available.
Emergencies ; Humans

PURPOSE: To measure the magnetization transfer ratio(MTR) of intracranial tumors and to evaluate the difference of the character and the border of tumors on magnetization transfer image. MATERIALS AND METHODS: We prospectively reviewed magnetization transfer imaging(MTI) findings of intracranial tumors of 13 patients. 1.0T MRI machine was used. T1 weighted image(TRITE=700/14) and T1 weighted magnetization transfer image were obtained. The offset and bandwidth of magnetization transfer pulse were 1000 Hz and 250Hz, respectively. Postcontrast images were also obtained. MTR was measured at lesion area. RESULTS: The mean of normal MTR of white matter and gray matter in 7 normal volunteers were 37% and 29%, respectively. The MTR of each tumor was as follows;metastatic tumors(mean 16.3%), meningioma(mean 27.3%), oligodendroglioma(mean 20.2%), glomus jugulare tumor(mean 17.3%), gliomatosis cerebri(mean 27. 0%). The contrast of lesions were better at magnetization transfer image than at T1 weighted image. CONCLUSION: The MTR of the intracranial tumors is lower than normal tissue. Measurement of MTR at muirpie areas within the tumor can be useful for evaluation of indistinct border of the tumor.
Glomus Jugulare ; Healthy Volunteers ; Humans ; Magnetic Resonance Imaging ; Prospective Studies

PURPOSE: The standard treatment for aortic aneurysms is surgical replacement with a prosthetic graft. Currently there is great interest in endoluminal intervention for treatment of aortic aneurysm. The purpose of this study was to evaluate the safety and effectiveness of endoluminally placed Stent-graft for the treatment of aortic aneurysms. MATERIALS AND METHODS: Transluminal endovascular Stent-graft placements were attempted in 9 patients with infra-renal aortic aneurysms(n=6), thoracic aortic aneurysm(n=l), and aortic dissection(n=2). The endovascular Stent-grafts were custom-designed for each patient and were constructed of self-expandable modified Gianturco Stents covered with polytetrafluroethylene. The Stent-grafts were introduced through a 16-18 french sheath and expanded to 17-30mm in diameter. The endovascular therapy was performed using a common femoral artery cutdown with local anesthesia. RESULTS: The endovascular Stent-graft deployment was achieved in 7 of 9 patients. Two cases failed deployment of the Stent-graft due to lilac artery stenosis and tortousity. There were complete thrombosis of the thoracic and infra-renal aortic aneurysm surround the Stent-graft in 3 patients, and persistent leak with partial thrombosis in 2. Two patients with aortic dissection were successfully treated by obliteration of entry tears. There were no major complication associated with Stent-graft placement. CONCLUSION: These preliminary results show that transluminal endovascular Stent-grafts offer great promise and good results. Further investigation is needed to establish its long-term safety and efficacy.
Anesthesia, Local ; Aortic Aneurysm ; Arteries ; Constriction, Pathologic ; Femoral Artery ; Humans ; Stents ; Thrombosis ; Transplants

No abstract available.
Bacterial Infections* ; Occupational Diseases*

Cephalic tetanus is defined as a combination of trismus and paralysis of one or more cranial nerves. Cranial nerves III, IV, VI, VII, and XII may be affected, but the facial nerve is most frequently implicated. A 64-year-old female visited hospital for left ptosis followed by facial palsy after a left forehead abrasion in a car accident. At nine days post injury, left ptosis developed, left facial palsy developed twelve days post injury, and at fifteen days post injury, trismus and dysphagia developed. The following day, there was progression of symptoms to generalized tetanus, such as dyspnea and generalized rigidity. Videofluoroscopic swallow study showed penetration and aspiration. We report a case of cephalic tetanus with ptosis, facial palsy, and dysphagia, which progressed to generalized tetanus.
Cranial Nerves ; Deglutition Disorders ; Dyspnea ; Facial Nerve ; Facial Paralysis ; Female ; Forehead ; Humans ; Middle Aged ; Paralysis ; Tetanus ; Trismus

PURPOSE: The most common cause of acute pancreatitis is alcohol abuse, followed by gallstones and pancreatic trauma. Pancreatitis is treated nonoperatively by inhibiting the causes, which include prohibition of alcohol abuse and cholecystectomy for the removal of gallstones. However, in case of a pseudocyst formation, necrotizing pancreatitis or abscesses remained as the complications of severe pancreatitis. Adequate surgical drainage is very important for the treatment of the complications. Adequate surgical procedure for treatment of chronic pancreatitis, causing intractable pain, pseudocyst, and obstruction of pancreatic or bile ducts, should be considered, not only for the patients physical and psychological recovery from a chronically debilitating status, but also in its differentiation from a malignancy. METHODS: Between July 1997 and January 2002, a review and analysis was undertaken of 33 pancreatitis patients, who had been treated, by surgical intervention, for the complications of acute pancreatitis, chronic pancreatitis, and benign pancreatic disease. RESULTS: For the treatment of the various complications in the 33 patients, 20 drainage procedures and 13 surgical resections were used. There were minor complications in 6 patients (21%), and two mortalities, one from multiple organ failure, due to necrotizing pancreatitis, and the other from a surgical complication, due to a duodenum preserving pancreatic head resection. CONCLUSION: The timely surgical drainage, and/or debridement, is critical for patients with complications due to acute pancreatitis. It is difficult to differentiate chronic pancreatitis from a malignancy. Adequate surgical procedures for the different stati ('type oriented surgery') are required for chronic pancreatitis. A resection of cystic lesions, with the possibility of a malignancy, should be considered. We can confirm the diagnosis, and treat the disease, by adequate operative and drainage procedures, or by resection of the main lesion.
Abscess ; Alcoholism ; Bile Ducts ; Cholecystectomy ; Debridement ; Diagnosis ; Drainage ; Duodenum ; Gallstones ; Head ; Humans ; Mortality ; Multiple Organ Failure ; Pain, Intractable ; Pancreatic Diseases ; Pancreatitis* ; Pancreatitis, Chronic