• Korean Journal of Bronchoesophagology
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• v.17 no.1
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• pp.5-8
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• 2011

The proliferation of new technologies has significantly enhanced the diagnostic capabilities of flexible bronchoscopy compared with traditional methods. Narrow band imaging (NBI), an optical technique in which filtered light enhances superficial neoplasms based on their neoangiogenic patterns, was developed to screen for central intraepithelial moderate or severe dysplasia, carcinoma in situ (CIS), and microinvasive neoplasia in patients at risk for lung cancer. Because angiogenesis occurs preferentially in dysplastic and neoplastic lesions, NBI may identify early dysplastic lesions better than white light bronchoscopy (WLB) currently in use. NBI bronchoscopy can be used not only to detect precancerous lesions, but also to screen for cancerous lesions. We prospectively evaluated 101 patients with suspected lung cancer between July 2009 and June 2010. All were previously scheduled for flexible bronchoscopy CT scans. Abnormal NBI was defined by Shibuya's descriptors (tortuous, dotted, or spiral and screw patterns). Biopsies of 132 lesions in 92 patients showed that 78 lesions (59.1%) were malignant and 54 (40.9%) were benign. The diagnostic sensitivity of bronchoscopy in detecting malignancy was 96.2% (75/78). When assorted by lesion pattern, the sensitivity and specificity of NBI bronchoscopy in detecting malignancies were 69.2% (54/78) and 96.3% (52/54), respectively, for the spiral and screw pattern and 14.1% (11/78) and 96.3% (52/54), respectively, for the dotted pattern. Unexpectedly, additional cancerous lesions were detected in five patients (2 dotted and 3 spiral and screw). As a screening tool for malignant lesions, NBI bronchoscopy should assess combinations of all three lesion. The dotted and spiral and screw patterns may be helpful in determining which lesions should be biopsied. NBI bronchoscopy may be useful not only for the diagnosis of early-stage lung cancer but also for more accurate local staging of lung cancer.

• Journal of the Korean Society of Radiology
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• v.84 no.6
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• pp.1290-1308
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• 2023

Purpose To compare the diagnostic performance of rectal CT with that of high-resolution rectal MRI and histopathology in assessing rectal cancer. Materials and Methods Sixty-seven patients with rectal cancer who underwent rectal CT with rectal distension using sonographic gel and high-resolution MRI were enrolled in this study. The distance from the anal verge/anorectal junction, distance to the mesorectal fascia (MRF), extramural depth (EMD), extramesorectal lymph node (LN) involvement, extramural venous invasion (EMVI), and T/N stages in rectal CT/MRI were analyzed by two gastrointestinal radiologists. The CT findings of 20 patients who underwent radical surgery without concurrent chemoradiotherapy were compared using histopathology. Interclass correlations and kappa statistics were used. Results The distance from the anal verge/anorectal junction showed an excellent intraclass correlation between CT and MRI for both reviewers. For EMD, the distance to the MRF, presence of LNs, extramesorectal LN metastasis, EMVI, T stage, and intermodality kappa or weighted kappa values between CT and MRI showed excellent agreement. Among the 20 patients who underwent radical surgery, T staging, circumferential resection margin involvement, EMVI, and LN metastasis on rectal CT showed acceptable concordance rates with histopathology. Conclusion Dedicated rectal CT may be on par with rectal MRI in providing critical information to patients with rectal cancer.

• Journal of The Korean Radiological Technologist Association
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• v.30 no.1
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• pp.131-142
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• 2004

In this study, when intravenous contrast medium was injected in spiral CT study, the effects of injection volume, injection rate, injection mode, location and lumen of IV catheter on enhancement of contrast medium in aorta, portal vein and liver parenchym

• Proceedings of the KSMRM Conference
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• 2003.10a
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• pp.41-41
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• 2003

To evaluate whether mangafodipir trisodium (Mn-DPDP)-enhanced magnetic resonance (MR) imagingimproves the detection and characterization of small (2 cm) hepatic lesions in patients with colorectal carcinoma, compared with spiral CT.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2038-2039
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• 2007

In this work, a novel semi-internal type UHF PD sensor has been proposed and related investigations has been performed in order to detect the partial discharges that could be possibly produced at the insulation system of the gas insulated switchgear(GIS). This sensor was designed to mount on the CT terminal hole of GIS using the spiral antenna theory. Therefore this type sensor can be install on GIS during the power apparatus has been operation and better sensitivity compare to the commercial external type UHF PD sensor.

• Journal of Yeungnam Medical Science
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• v.29 no.1
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• pp.14-18
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• 2012

Background: The purpose of this study was to differentiate chromophobe renal cell carcinoma and clear cell renal cell carcinoma on helical CT. Methods: The CT images of 9 patients histopathologically proven to have chromophobe renal cell carcinoma and 20 patients with clear cell renal cell carcinoma were reviewed. The tumor sizes, margins, enhancement degrees and patterns, presence or absence of calcification, and tumor spread patterns (including perinephric changes, venous invasion, lymphadenopathy, and distant metastasis) were compared. Results: All the chromophobe renal cell carcinomas showed well-demarcated margins. Thechromophobe renal cell carcinomas showed milder enhancements than the clear cell renal cell carcinomas. The sensitivity and specificity for differentiating the chromophobe renal cell carcinoma from the clear cell renal cell carcinoma were 100 and 88%, respectively, when 101 Hounsfield units was used as the cut-off value in the corticomedullary phase, and 95 and 100% when a less-than-three-time enhancement change was used as a cut-off value in the corticomedullary phase (p<0.05). The chromophobe renal cell carcinomas (67%) tended to show a homogeneous enhancement whereas the clear cell renal cell carcinomas (85%) usually showed a heterogeneous enhancement (p<0.05). Statistical analysis revealed that the frequencies of the tumor spread pattern and calcification in the two subtypes didnot differ significantly (p>0.05). Conclusion: The CT findings of the chromophobe renal cell carcinomascompared to those of the clear cell renal cell carcinomas showed that there were mild enhancements in the corticomedullary phase, homogeneous enhancements, and well-demarcated margins.

• Tuberculosis and Respiratory Diseases
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• v.56 no.1
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• pp.85-90
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• 2004

A 69 year-old female was admitted to the hospital due to intermittent hemoptysis for 1 month. Emergent bronchoscopy revealed mass-like lesion almost completely obstructing right intermediate bronchus with multiple hemorrhagic spots. Bronchial arterial angiography was performed but failed to find out actively bleeding vessel. Spiral computerized tomography of the chest showed contrast enhanced bulging of the posterior portion of right main bronchus into the lumen of right intermediate bronchus suggesting Rasmussen aneurysm. The AFB smear of bronchial washing fluid was positive. Pulmonary arterial angiography and embolization were not performed due to improvement of clinical course with medical conservative care. Here we report a case of endobronchial mass-like Rasmussen aneurysm grossly suspected by bronchoscopy and diagnosed by spiral CT, which successfully managed by medical conservative care with antituberculous agents.

• Journal of the Korean Society of Radiology
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• v.9 no.1
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• pp.31-37
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• 2015

The cases of radiographic inspection for medical diagnosis in Korea have been continuously increasing year after year, which pays particularly more attention to CT which occupies over the half of medical radiation exposure. To find an effective alternative for reducing radiation exposure, the researchers conducted comparative experiments using some shields made of bismuth, aluminum 6mm, and silicone 22mm. These shielding materials have been used to reduce the entrance surface dose (ESD) on lenses, maintaining the CT number, noise, and uniformity in brain CT scanning which forms the largest part in CT scanning these days. These experiments showed that the doses in the spiral scan parallel to IOML and the conventional scan in Bismuth were 26.41% and 17.52%, respectively; in Aluminum 18.24% and 9.39%; in Silicone 19.47% and 14.39% lower than compared with those in the cases without any shields. In the items of the CT number, noise, and uniformity, the bismuth shield satisfied exceedingly the standards of the phantom image test while aluminum and silicone were within. To keep the graphic quality and get good shielding effect, we recommend the silicone shield which can be manufactured and purchased with ease.

• Progress in Medical Physics
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• v.16 no.1
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• pp.47-51
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• 2005

We report a case of an accidental extravasation of contrast material. A large-volume extravasation occurred in an adult during spiral contrast-enhanced CT. The amount of contrast material extravasated was 47 ml. The patient had a swelling of the dorsum right hand. The extravasation injury site was determined by CT scanning. The extavasation case was examined using five separate display techniques: axial, multi planar reformation (MPR), maximum intensity projection (MIP), volume rendering, and shaded-surfaced display (SSD). This paper introduces extravasation with the CT and the three-dimensional appearance.

• Tuberculosis and Respiratory Diseases
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• v.83 no.4
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• pp.283-288
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• 2020

Background: Latent tuberculosis (TB) infection among TB contacts is diagnosed using plain chest radiography and interferon-gamma release assays (IGRAs). However, plain chest radiographs often miss active TB, and the results of IGRA could fluctuate over time. The purpose of this study was to elucidate changes in the results of the serial IGRAs and in the findings of the serial submillisievert chest computed tomography (CT) scans among the close contacts of active pulmonary TB patients. Methods: Patients age 20 or older with active pulmonary TB and their close contacts were invited to participate in this study. Two types of IGRA (QuantiFERON-TB Gold In-Tube assay [QFT-GIT] and the T-SPOT.TB test [T-SPOT]) and submillisievert chest CT scanning were performed at baseline and at 3 and 12 months after enrollment. Results: In total, 19 close contacts participated in this study. One was diagnosed with active pulmonary TB and was excluded from further analysis. At baseline, four of 18 contacts (22.2%) showed positive results for QFT-GIT and T-SPOT; there were no discordant results. During the follow-up, transient and permanent positive or negative conversions and discordant results between the two types of IGRAs were observed in some patients. Among the 17 contacts who underwent submillisievert chest CT scanning, calcified nodules were identified in seven (41.2%), noncalcified nodules in 14 (82.4%), and bronchiectasis in four (23.5%). Some nodules disappeared over time. Conclusion: The results of the QFT-GIT and T-SPOT assays and the CT images may change during 1 year of observation of close contacts of the active TB patients.