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Korean journal of radiology : official journal of ... 11건

  1. [국내논문]   Non-Contiguous Spinal Injury in Cervical Spinal Trauma: Evaluation with Cervical Spine MRI  

    Choi, Soo-Jung (Department of Radiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Korea. ) , Shin, Myung Jin (Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Korea. ) , Kim, Sung Moon (Department of Radiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Korea. ) , Bae, Sang-Jin (Department of Radiology, Sanggyepaik Hospital, Inje University, Korea.)
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 219 - 224 , 2004 , 1229-6929 ,

    초록

    Objective We wished to evaluate the incidence of non-contiguous spinal injury in the cervicothoracic junction (CTJ) or the upper thoracic spines on cervical spinal MR images in the patients with cervical spinal injuries. Materials and Methods Seventy-five cervical spine MR imagings for acute cervical spinal injury were retrospectively reviewed (58 men and 17 women, mean age: 35.3, range: 18-81 years). They were divided into three groups based on the mechanism of injury; axial compression, hyperflexion or hyperextension injury, according to the findings on the MR and CT images. On cervical spine MR images, we evaluated the presence of non-contiguous spinal injury in the CTJ or upper thoracic spine with regard to the presence of marrow contusion or fracture, ligament injury, traumatic disc herniation and spinal cord injury. Results Twenty-one cases (28%) showed CTJ or upper thoracic spinal injuries (C7-T5) on cervical spinal MR images that were separated from the cervical spinal injuries. Seven of 21 cases revealed overt fractures in the CTJs or upper thoracic spines. Ligament injury in these regions was found in three cases. Traumatic disc herniation and spinal cord injury in these regions were shown in one and two cases, respectively. The incidence of the non-contiguous spinal injuries in CTJ or upper thoracic spines was higher in the axial compression injury group (35.3%) than in the hyperflexion injury group (26.9%) or the hyperextension (25%) injury group. However, there was no statistical significance ( p > 0.05). Conclusion Cervical spinal MR revealed non-contiguous CTJ or upper thoracic spinal injuries in 28% of the patients with cervical spinal injury. The mechanism of cervical spinal injury did not significantly affect the incidence of the non-contiguous CTJ or upper thoracic spinal injury.

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  2. [국내논문]   Follow-up Results After Negative Findings on Unenhanced Hepatic MR Imaging for Hepatic Metastasis from Rectal Cancer  

    Lim, Joon Seok (Department of Diagnostic Radiology, Yonsei University College of Medicine, Korea. ) , Kim, Myeong-Jin (Department of Diagnostic Radiology, Yonsei University College of Medicine, Korea. ) , Lee, Kang Young (Department of Surgery, Yonsei University College of Medicine, Korea. ) , Kim, Nam Kyu (Department of Surgery, Yonsei University College of Medicine, Korea. ) , Choi, Jin-Sub (Department of Surgery, Yonsei University College of Medicine, Korea. ) , Kim, Joo Hee (Department of Diagnostic Radiology, Yonsei University College of Medicine, Korea. ) , Oh, Young Taik (Department of Diagnostic Radiology, Yonsei University College of Medicine, Korea. ) , Kim, Won Ho (Department of Internal Medicine, Gastroenterology Division, Yonsei University College of Medicine, Korea. ) , Kim, Ki Whang (Department of Diagnostic Radiology, Yonsei University College of Medicine, Korea.)
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 225 - 230 , 2004 , 1229-6929 ,

    초록

    Objective To assess the follow-up results after negative findings on unenhanced hepatic MR imaging in rectal cancer patients who have undergone locally curative surgery. Materials and Methods From all pertinent imaging reports and medical records, we selected 255 patients who had negative results on unenhanced hepatic MR imaging. When selecting patients who had undergone curative resection, the following patients were excluded from the study: 1) patients in whom extrahepatic metastases were detected on preoperative staging work-ups, 2) patients in whom the surgery was judged to be non-curative due to peritoneal seeding or local aggressiveness. Cases with follow-up periods of less than 18 months were also excluded, as these cases were considered insufficient to confirm the negative outcomes. Thus, a total of 149 patients were ultimately enrolled in our study. The follow-up results of unenhanced MR imagings were assessed according to the assumption that the newly developed hepatic metastases had been false-negative lesions on preoperative MR image. Results During a median follow-up period of 29.3 months, 25 hepatic metastases were detected in 13 patients (8.7%), which indicated a negative predictive value of 91.3%. Conclusion Unenhanced hepatic MR imaging provides a high negative predictive value with regard to the detection of hepatic metastasis in the preoperative evaluation of rectal cancer.

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  3. [국내논문]   Follow-up result afters negative findings on unenhanced hepatic MR imaging for hepatic metastasis from rectal cancer.  

    Lim, Joon Seok ; Kim, Myeong-Jin ; Lee, Kang Young ; Kim, Nam Kyu ; Choi, Jin-Sub ; Kim, Joo Hee ; Oh, Young Taik ; Kim, Won Ho ; Kim, Ki Whang
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 225 - 230 , 2004 , 1229-6929 ,

    초록

    To assess the follow-up results after negative findings on unenhanced hepatic MR imaging in rectal cancer patients who have undergone locally curative surgery.

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  4. [국내논문]   Quantitative Evaluation of Liver Function with MRI Using Gd-EOB-DTPA  

    Ryeom, Hun-Kyu (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Kim, Seong-Hun (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Kim, Jong-Yeol (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Kim, Hye-Jeong (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Lee, Jong-Min (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Chang, Yong-Min (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Kim, Yong-Sun (Department of Radiology, Kyungpook National University School of Medicine, Korea. ) , Kang, Duk-Sik (Department of Radiology, Kyungpook National University School of Medicine, Korea.)
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 231 - 239 , 2004 , 1229-6929 ,

    초록

    Objective Gadolinium ethoxybenzyl diethylenetriaminepentaacetic acid (Gd-EOB-DTPA) is a newly developed MR contrast agent. After intravenous injection, Gd-EOB-DTPA is gradually taken up by the hepatocytes and eventually excreted via the biliary pathway without any change to its chemical structure. Because of these characteristics, it can be used as a tracer for quantitative liver function testing. The purpose of this study is to develop a noninvasive method of quantitation of the hepatic function using Gd-EOB-DTPA through the deconvolution analysis. Materials and Methods Adult New Zealand white rabbits (n = 10, average body weight = 3.5 kg) were used in the present study. Hepatic injury was induced to by the intragastric administration of carbon tetrachloride (CCl4) three times a week for three weeks. Liver enzyme (aspartate aminotransferase, AST; alanine aminotransferase, ALT) levels and the plasma indocyanine green (ICG) retention rate 15 minutes after an intravenous injection of ICG (ICG R15), was checked before and after the three-week administration of CCl4. At the end of experimental period, an observer "blinded" to the treatment given the rabbits performed the histological examination. MRI studies were performed before and after the three-week administration of CCl4 on a 1.5 T scanner using a human extremity coil. After intravenous bolus injection of Gd-EOB-DTPA (0.3 mL of Gd-EOB-DTPA freshly prepared in 2.7 mL of normal saline) through the ear vein, the 250 axial single level dynamic MR images were obtained using a fast low angle shot (FLASH, TR/TE = 11/4.2 msec, flip angle = 15, acquisition time 1 second, slice thickness = 5 mm, matrix = 128×128, field of view = 120 mm) sequence with 1.5 sec time intervals. The time-intensity curves were obtained at the abdominal aorta and the liver parenchyma that was devoid of blood vessels. Deconvolution analysis of the aortic (input function) and hepatic parenchymal (output function) time-intensity curves was performed with a modified Fourier transform technique to calculate the hepatic extraction fraction (HEF). The presence and type of hepatic injury were determined by the histopathologic examination and statistical analysis of the changes of the hepatic enzyme levels, the ICG R15 and Gd-EOB-DTPA HEF values between the time before and after CCl4 administration with Wicoxon signed rank test. Correlation between the Gd-EOB-DTPA HEF and the change of the ICG R15 were analyzed with Pearson's correlation coefficient. Results Histopathologic examination showed findings that were compatible with hepatic fibrosis caused by chronic liver injury. The initial blood biochemical studies before the administration of carbon tetrachloride showed that the mean AST and ALT levels were 39.8±5.2 IU/L and 59.1±11.7 IU/L, respectively. The AST and ALT levels increased to 138.4±50.5 IU and 172.0±71.6 IU/L, respectively, after the three week administration of CCl4. The ALT and AST levels were significantly increased after the three weeks of CCl4 administration ( p = 0.018). The ICG R15 values were 4.47±2.08% and 19.43±3.98% before and after three-week administration of CCl4, respectively. The ICG R15 values were significantly increased after hepatic injury ( p = 0.018). After normalizing the HEF as 100% in each rabbit before CCl4 administration, the deconvoluted curve after CCl4 administration revealed less hepatocyte extraction efficiency with a mean value of 77.7±3.6. There was a significant correlation between the HEF and changes of the ICG R15 by the Pearson correlation coefficient assessment (correlation coefficient = -0.965, p = 0.000). Conclusion The Gd-EOB-DTPA HEF could be calculated from deconvolution analysis of aortic and hepatic parenchymal time-intensity curves obtained by dynamic MRI. The Gd-EOB-DTPA HEF was well correlated with changes of the ICG R15, which is the most common para

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  5. [국내논문]   Radiofrequency ablation of rabbit liver in vivo: effect of the pringle maneuver on pathologic changes in liver surrounding the ablation zone.  

    Kim, Seung Kwon , Lim, Hyo K , Ryu, Jeong-ah , Choi, Dongil , Lee, Won Jae , Lee, Ji Yeon , Lee, Ju Hyun , Sung, Yon Mi , Cho, Eun Yoon , Hong, Seung-Mo , Kim, Jong-Sung
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 240 - 249 , 2004 , 1229-6929 ,

    초록

    We wished to evaluate the effect of the Pringle maneuver (occlusion of both the hepatic artery and portal vein) on the pathologic changes in the hepatic vessels, bile ducts and liver parenchyma surrounding the ablation zone in rabbit livers.

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  6. [국내논문]   Optimization of wet radiofrequency ablation using a perfused-cooled electrode: a comparative study in ex vivo bovine livers.  

    Lee, Jeong Min , Han, Joon Koo , Kim, Se Hyung , Lee, Jae Young , Shin, Kyung Sook , Han, Chang Jin , Lee, Min Woo , Choi, Jun Il , Choi, Byung Ihn
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 250 - 257 , 2004 , 1229-6929 ,

    초록

    To determine the optimized protocol for wet monopolar radiofrequency ablation (RFA) using a perfused-cooled electrode to induce coagulation necrosis in the ex vivo bovine liver.

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  7. [국내논문]   Comparison of Wet Radiofrequency Ablation with Dry Radiofrequency Ablation and Radiofrequency Ablation Using Hypertonic Saline Preinjection: Ex Vivo Bovine Liver  

    Lee, Jeong Min (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea. ) , Han, Joon Koo (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea. ) , Kim, Se Hyung (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea. ) , Shin, Kyung Sook (Department of Radiology, Chungnam National University College of Medicine, Korea. ) , Lee, Jae Young (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea. ) , Park, Hee Sun (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea. ) , Hur, Hurn (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea. ) , Choi, Byung Ihn (Department of Radiology, and Institute of Radiation Medicine, Seoul National University College of Medicine, Korea.)
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 258 - 265 , 2004 , 1229-6929 ,

    초록

    Objective We wished to compare the in-vitro efficiency of wet radiofrequency (RF) ablation with the efficiency of dry RF ablation and RF ablation with preinjection of NaCl solutions using excised bovine liver. Materials and Methods Radiofrequency was applied to excised bovine livers in a monopolar mode for 10 minutes using a 200 W generator and a perfused-cooled electrode with or without injection or slow infusion of NaCl solutions. After placing the perfused-cooled electrode in the explanted liver, 50 ablation zones were created with five different regimens: group A; standard dry RF ablation, group B; RF ablation with 11 mL of 5% NaCl solution preinjection, group C; RF ablation with infusion of 11 mL of 5% NaCl solution at a rate of 1 mL/min, group D; RFA with 6 mL of 36% NaCl solution preinjection, group E; RF ablation with infusion of 6 mL of 36% NaCl solution at a rate of 0.5 mL/min. In groups C and E, infusion of the NaCl solutions was started 1 min before RF ablation and then maintained during RF ablation (wet RF ablation). During RF ablation, we measured the tissue temperature at 15 mm from the electrode. The dimensions of the ablation zones and changes in impedance, current and liver temperature during RF ablation were then compared between the groups. Results With injection or infusion of NaCl solutions, the mean initial tissue impedance prior to RF ablation was significantly less in groups B, C, D, and E (43-75 Ω) than for group A (80 Ω) (p 3 in group A; 12.4 ± 3.8 cm 3 in group B; 80.9 ± 9.9 cm 3 in group C; 45.3 ± 11.3 cm 3 in group D and 81.6 ± 8.6 cm 3 in group E. The tissue temperature measured at 15 mm from the electrode was higher in groups C, D and E than other groups (p Conclusion Wet RF ablation with 5% or 36% NaCl solutions shows better efficiency in creating a large ablation zone than does dry RF ablation or RF ablation with preinjection of NaCl solutions.

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  8. [국내논문]   Fixation methods for implantable port chamber: comparative study using glue, self-stabilizing leg and suture fixations in rabbits.  

    Na, Hyoung Il , Shim, Hyung Jin , Kwak, Byung Kook , Kim, Hyeon Joo , Lee, Yong Cheol
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 266 - 273 , 2004 , 1229-6929 ,

    초록

    To evaluate the fixation strength and tissue reaction of the glue fixation and self-stabilizing leg fixation methods and to compare the results with those of the conventional tagging suture fixation method.

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  9. [국내논문]   MR Imaging Findings of Painful Type II Accessory Navicular Bone: Correlation with Surgical and Pathologic Studies  

    Choi, Yun Sun (Department of Diagnostic Radiology, Eulji Hospital, Eulji University School of Medicine, Korea. ) , Lee, Kyung Tai (Department of Orthopedic Surgery, Eulji Hospital, Eulji University School of Medicine, Korea. ) , Kang, Heung Sik (Department of Diagnostic Radiology, Seoul National University Bundang Hospital, Korea. ) , Kim, Eun Kyung (Department of Pathology, Eulji Hospital, Eulji University School of Medicine, Korea.)
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 274 - 279 , 2004 , 1229-6929 ,

    초록

    Objective To evaluate the MR imaging findings of painful type II accessory navicular bone and to correlate these with the surgical and pathologic findings. Materials and Methods The MR images of 17 patients with medial foot pain and surgically proven type II accessory navicular abnormalities were reviewed. The changes of signal intensity in the accessory navicular, synchondrosis and adjacent soft tissue, the presence of synchondrosis widening, and posterior tibial tendon (PTT) pathology on the T1-weighted and fat-suppressed T2-weighted images were analyzed. The MR imaging findings were compared with the surgical and pathologic findings. Results The fat-suppressed T2-weighted images showed high signal intensity in the accessory navicular bones and synchondroses in all patients, and in the soft tissue in 11 (64.7%) of the 17 patients, as well as synchondrosis widening in 3 (17.6%) of the 17 patients. The MR images showed tendon pathology in 12 (75%) of the 16 patients with PTT dysfunction at surgery. The pathologic findings of 16 surgical specimens included areas of osteonecrosis with granulomatous inflammation, fibrosis and destruction of the cartilage cap. Conclusion The MR imaging findings of painful type II accessory navicular bone are a persistent edema pattern in the accessory navicular bone and within the synchondrosis, indicating osteonecrosis, inflammation and destruction of the cartilage cap. Posterior tibial tendon dysfunction was clinically evident in most patients.

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  10. [국내논문]   Non-Infectious Ischiogluteal Bursitis: MRI Findings  

    Cho, Kil-Ho (Department of Diagnositic Radiology, Yeungnam University College of Medicine, Korea. ) , Lee, Sung Moon (Department of Diagnositic Radiology, Keimyung University College of Medicine, Korea. ) , Lee, Young Hwan (Department of Diagnositic Radiology, Daegu Hyosung Catholic University College of Medicine, Korea. ) , Suh, Kyung Jin (Suh & Joo MR Clinic, Korea. ) , Kim, Sung Moon (Department of Diagnositic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Korea. ) , Shin, Myung Jin (Department of Diagnositic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Korea. ) , Jang, Han Won (Department of Diagnositic Radiology, Yeungnam University College of Medicine, Korea.)
    Korean journal of radiology : official journal of the Korean Radiological Society v.5 no.4 ,pp. 280 - 286 , 2004 , 1229-6929 ,

    초록

    Objective We wished to report on the MRI findings of non-infectious ischiogluteal bursitis. Materials and Methods The MRI findings of 17 confirmed cases of non-infectious ischiogluteal bursitis were analyzed: four out of the 17 cases were confirmed with surgery, and the remaining 13 cases were confirmed with MRI plus the clinical data. Results The enlarged bursae were located deep to the gluteus muscles and postero-inferior to the ischial tuberosity. The superior ends of the bursal sacs abutted to the infero-medial aspect of the ischial tuberosity. The signal intensity within the enlarged bursa on T1-weighted image (WI) was hypo-intense in three cases (3/17, 17.6%), iso-intense in 10 cases (10/17, 58.9%), and hyper-intense in four cases (4/17, 23.5%) in comparison to that of surrounding muscles. The bursal sac appeared homogeneous in 13 patients (13/17, 76.5%) and heterogeneous in the remaining four patients (4/17, 23.5%) on T1-WI. On T2-WI, the bursa was hyper-intense in all cases (17/17, 100%); it was heterogeneous in 10 cases and homogeneous in seven cases. The heterogeneity was variable depending on the degree of the blood-fluid levels and the septae within the bursae. With contrast enhancement, the inner wall of the bursae was smooth (5/17 cases), and irregular (12/17 cases) because of the synovial proliferation and septation. Conclusion Ischiogluteal bursitis can be diagnosed with MRI by its characteristic location and cystic appearance.

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