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A Study Using Diffusion-Weighted MR Image in the Experimental Models with Diffusion Difference.

Pyung Hwan PARK ; Tae Hwan LIM ; Ghee Young CHOE ; Dae Chul SUH ; Ho Kyu LEE ; Ki Young KO ; Tae Keun LEE ; Chi Woong MOON ; Dae Geon SEO

Journal of the Korean Radiological Society.1995;33(2):165-170. doi:10.3348/jkrs.1995.33.2.165

PURPOSE: To see the stability and error in the diffusion-weighted magnetic resonance (MR) imaging technique in the experimental models and to observe the signal intensities in the early cerebral lesions of the animal models. MATERIALS AND METHODS: Diffusion coefficients of acetone and distilled water were measured by diffusion-weighted MR image and were compared with actual values. Differentiation of diffusion from perfusion were done at the resin flow phantom. The signal intensities caused by early parenchymal changes were measured in normal, hypovolemic, and embolic, and dead animal models by using diffusion-weighted image and compared with pathoIogic finding and vital staining. RESULTS: Diffusion coefficients of acetone and distilled water were 4.48 x 10-3 and 2.72 x 10-3 which were very close to the actual values. Diffusion-weighted MR image obtained at flow phantom was not affected by flow (perfusion) at the 100-400 of b-factor range. Animal study done at that b-factor range revealed a significant signal difference between the left and right sides only at the embolic model induced by polyvinyl alchol particles (p<0.05). These changes were not detected in microscopic finding but could be identified in vital staining. CONCLUSION: Diffusion-weighted MR image can be used to detect early parenchymal change when the appropriate b-factor range was applied.
Acetone ; Animals ; Diffusion* ; Hypovolemia ; Models, Animal ; Models, Theoretical* ; Perfusion ; Polyvinyls ; Water

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Mammographic & Sonographic findings of Adenomyoepithelioma of the Breast: Case Report.

You Me KIM

Journal of the Korean Radiological Society.2003;49(6):513-516. doi:10.3348/jkrs.2003.49.6.513

Adenomyoepithelioma is very rare. Because of its rarity, adeonomyoepithelioma may present a diagnostic challenge to the radiologists and there is a little information on the diagnosis and treatment of this condition. I report on two patients with benign and malignant adenomyoepitheliomas which represent breast masses on mammograms and ultrasonograms. The diagnosis was confirmed by immunohistochemical study of the resected specimens.
Adenomyoepithelioma* ; Breast* ; Diagnosis ; Humans ; Ultrasonography*

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Clinical Image Evaluation of Mammograms: A National Survey.

Woo Kyung MOON ; Tae Jung KIM ; Joo Hee CHA ; Kyung Soo CHO ; Eun Wan CHOI ; Yu Jin LEE ; Mi Hye KIM ; Boo Kyung HAN ; Yeon Hyeon CHOE ; Eun Kyung KIM ; Hye Young CHOI ; Soo Young CHUNG ; Sun Yang CHUNG ; Nariya CHO ; Jung Gi IM ; Kyung Mo YEON

Journal of the Korean Radiological Society.2003;49(6):507-511. doi:10.3348/jkrs.2003.49.6.507

PURPOSE: The goal of this study was to survey the overall quality of mammographic images in Korea. MATERIALS AND METHODS: A total of 598 mammographic images collected from 257 hospitals nationwide were reviewed in terms of eight image quality categories, namely positioning, compression, contrast, exposure, sharpness, noise, artifacts, and examination identification, and rated on a five-point scale: (1=severe deficiency, 2=major deficiency, 3=minor deficiency, 4=good, 5=best). Failure was defined as the occurrence of more than four major deficiencies or one severe deficiency (score of 1 or 2). The results were compared among hospitals of varying kinds, and common problems in clinical image quality were identified. RESULTS: Two hundred and seventeen mammographic images (36.3%) failed the evaluation. Poor images were found in descending order of frequency, at The Society for Medical Examination (33/69, 47.8%), non-radiology clinics (42/88, 47.7%), general hospitals (92/216, 42.6%), radiology clinics (39/102, 38.2%), and university hospitals (11/123, 8.9%) (p<0.01, Chi-square test). Among the 598 images, serious problems which occurred were related to positioning in 23.7% of instances (n=142) (p<0.01, Chi-square test), examination identification in 5.7% (n=34), exposure in 5.4% (n=32), contrast in 4.2% (n=25), sharpness in 2.7% (n=16), compression in 2.5% (n=15), artifacts in 2.5% (n=15), and noise in 0.3% (n=2). CONCLUSION: This study showed that in Korea, 36.3% of the mammograms examined in this sampling had important image-related defects that might have led to serious errors in patient management. The failure rate was significantly higher in non-radiology clinics and at The Society for Medical Examination than at university hospitals.
Artifacts ; Hospitals, General ; Hospitals, University ; Humans ; Korea ; Mammography ; Noise

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Radiologic Findings of Cystic Fibrosis in a Korean Child at Follow Up Study: Case Report.

Il Soo JANG ; Choong Ki PARK ; Seok Chol JEON ; Yo Won CHOI ; Dong Woo PARK ; Yongsoo KIM ; Young Sun KIM ; You Hern AHN

Journal of the Korean Radiological Society.2003;49(6):503-506. doi:10.3348/jkrs.2003.49.6.503

Cystic fibrosis is a hereditary disease involving recessive transmission. The fundamental abnormality consists of the production of abnormal secretion from a variety of exocrine glands such as salivary and sweat glands and those of the pancreas, colon, and tracheobronchial trees. Cystic fibrosis is the most common lethal genetically transmitted disease among whites, but is uncommon in Asians, including Koreans. Although a case involving a Korean was reported in 1988, the focus was diagnosis rather than the radiological findings. In the case of cystic fibrosis we now describe, the focus is inverted: we enphasise the reported in 1988, focusing on radiologic findings.
Asian Continental Ancestry Group ; Child* ; Colon ; Cystic Fibrosis* ; Diagnosis ; Exocrine Glands ; Follow-Up Studies* ; Genetic Diseases, Inborn ; Humans ; Lung ; Pancreas ; Sweat Glands

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Comparison of Compression Methods of Radiological Images for the Personal Archive.

Young Sun KIM ; Jong Hwa LEE ; Jong Oag PARK ; Tae Sung KI ; Jin Woo CHUNG ; Young Joon LEE

Journal of the Korean Radiological Society.1995;32(3):507-514. doi:10.3348/jkrs.1995.32.3.507

PURPOSE: This study was performed to evaluate the usefulness of compression of radiologic images by using personal computer(PC) and the clinically acceptable compression ratio for personal archiving. MATERIALS AND METHODS: The 300 images of total 60 cases including 10 cases each of plain radiograph, angiography, barium study, US, CT, and MRI were obtained from video camera recorder and were digitalized at image board of PC with 628 x430 matrix and archived to 8 bit gray scale for BMP, TIFF, PCX, GIF, 16 bit color for TGA, and 8 bit gray scale and 24 bit color for JPEG. We compared the image quality on each of the 6 image file formats and various compression ratios by using a ROC(receiver operating characteristic) analysis. RESULTS: The file size order was TGA, BMP, PCX, TIFF, GIF, and the smallest JPEG. The excution time for compression and decompression of images ranged from 10 to 20 seconds and from 4 to 7 seconds, respectively. The compression ratio for TGA and TIFF, PCX, and GIF was less than 1.5:1 whereas it was more than 3:1 for JPEG. The higher the compression ratio of JPEG, the more degradation of image quality occurred although compression ratio below 20:1 made no considerable difference. In the remainder, the image quality was same before and after the compression. The digital images of US, CT, and MR showed lower degradation of image quality than plain radiograph, angiography, and barium study. CONCLUSION: The clinically acceptable limiting compression ratio of JPEG was 20: 1 which would be adequate for managing the large volume of image database on a PC-based digital imaging system.
Angiography ; Archives* ; Barium ; Decompression ; Humans ; Magnetic Resonance Imaging

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Misdiagnosed Breast Cancer on Mammography Retrospective Analysis in 17 Cases.

Jeong Hyun YOO ; Hye Yooung CHOI ; Sei Hyun AHN

Journal of the Korean Radiological Society.1995;32(3):501-506. doi:10.3348/jkrs.1995.32.3.501

PURPOSE: Misdiagnosed breast cancer on screening mammography was retrospectively reviewed in an attempt to analyze the cause for the undiscovery and to determine findings that might have been suggested on the mammographic examination. MATERIALS AND METHODS: Of the 173 breast cancers that were pathologically proven, 17 breast cancers misdiagnosed on mammogram was retrospectively analyzed for the causes of the misinterpretation and predominant secondary findings. RESULTS: Three of the 17 were negative on mammography except for dense breast. Two patients had localized asymmetricity without visible mass. Ten patients had benign-looking mass which was well-defined (n=5), partially defined(n=2), multiple (n=l), or included benign-looking calcifications(n=2). Remaining two cases were retrospectively diagnosed as misinterpreted breast cancers. Various secondary findings such as were useful in the diagnosis of breast cancer. CONCLUSION: Meticulous observation could improve the diagnostic yield of breast cancer in mammography.
Breast Neoplasms* ; Breast* ; Diagnosis ; Humans ; Mammography* ; Mass Screening ; Retrospective Studies*

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The Usefulness of CT-guided Fine-needle Aspiration of Lymph Nodes in Uterine Cervical Carcinoma.

Byung Hee LEE ; Kie Hwan KIM ; Soo Yil CHIN ; Hoon Il OH ; Sun Ah KIM

Journal of the Korean Radiological Society.1995;32(3):497-500. doi:10.3348/jkrs.1995.32.3.497

PURPOSE: The purpose of this study was to evaluate the usefulness of CT-guided percutaneous needle aspiration(PCNA) of paraaortic and pelvic lymph nodes in patients with uterine cervical carcinoma. MATERIALS AND METHODS: CT-guided PCNA was performed in 18 patients with treated cervical carcinoma. initial clinical stages were CIS in one, lb in three, lib in ten, and IIIb in four cases. We used 20 gauge Westcott needles for aspiration. Mean depth from skin to lymph nodes was 10.0cm in paraaortic group (n=13) and was 7.9cm in pelvic group (n=5). The size of lymph nodes ranged 1.0-3.0cm (mean :1.8) and 1.5-5.0cm (mean :2.6cm), respectively. RESULTS: All cases with paraaortic lymph node enlargement were proved to be metastatic lymphadenopathy. In five cases with pelvic lymph node enlargement, three were proved to be malignancy and two were negative. Among 16 cases with metastatic lymphadenopathy, eight patients were treated with chemotherapy, five with radiation therapy, and three with chemotherapy and radiotherapy. In two cases with negative results lymph nodes were disappeared or unchanged on follow up CT scans. No complications were encountered during CT-guided PCNA procedure. CONCLUSION: CT-guided PCNA of paraaortic and pelvic lymph nodes is a useful method in determining metastasis from cervical carcinoma and in planning further treatment.
Biopsy, Fine-Needle* ; Drug Therapy ; Follow-Up Studies ; Humans ; Lymph Nodes* ; Lymphatic Diseases ; Needles ; Neoplasm Metastasis ; Proliferating Cell Nuclear Antigen ; Radiotherapy ; Skin ; Tomography, X-Ray Computed

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US and CT Findings of Small Renal Cell Carcinoma.

Man Chung HAN ; Seung Hyup KIM ; Cheol Soo SEO

Journal of the Korean Radiological Society.1995;32(3):491-496. doi:10.3348/jkrs.1995.32.3.491

PURPOSE: To evaluate US and CT characteristics of small renal cell carcinomas with diameter less than 3cm. MATERIALS AND METHODS: We retrospectively analysed US and CT findings of the small renal cell carcinomas which were surgically confirmed. We analysed echogenicity, peritumoral hypoechoic rim, intratumoral cysts on US. We analysed CT with viewpoints of tumor margin, growth pattern, renal contour change, attenuation on pre- and postcontrast scan, homogeneity, and perirenal changes. RESULTS: The US characteristics of the small renal cell carcinomas were hyperechogenicity(89%), peritumoral hypoechoic rim(66%) and intratumoral cysts(44%). They had relatively well-defined margin(90%), smooth and round contour(90%), endophytic growth pattern(65%), and outward bulging of renal contour(75%) on CT. They had iso- or high attenuation(87%) on precontrast CT, and were relatively homogeneous low-attenuated on postcontrast CT. CONCLUSION: The constellation of US and CT findings may be helpful in the diagnosis and understanding of the internal architecture of the small renal cell carcinomas.
Carcinoma, Renal Cell* ; Diagnosis ; Retrospective Studies

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Arterial Priapism: Superselective Embolization using Autologous Blood Clot.

Jong Min LEE ; Hyun Ki YOON ; Dae Gyu PARK ; Seung Wha JEONG

Journal of the Korean Radiological Society.1995;32(3):487-490. doi:10.3348/jkrs.1995.32.3.487

A case of arterial priapism was treated by superselective transcatheteric autologous clot embolization of cavernosal artery 25 days after blunt periheal trauma. No immediate improvement was noted but the priapism subsided on 48th day after the procedure. Normal physiclogic erectlie function was achieved on 53rd day after the procedure, and the period of postprocedure impotence was shortened, as compared with previously reported cases. Autologous blood clot embolization may be an effective treatment method even in delayed priapism, and superselective technique is thought to be more effective to shorten the postprocedure erectlie dysfunction
Arteries ; Erectile Dysfunction ; Male ; Priapism*

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Sonographic Findings of Ovarian Mass Torsion.

Jee Yeong YUN ; Yeon Hee OH ; Deok Ki HA

Journal of the Korean Radiological Society.1995;32(3):483-486. doi:10.3348/jkrs.1995.32.3.483

PURPOSE: To evaluete the sonographic features of ovarian mass torsion. MATERIALS AND METHODS: We evaluated the sonographic findings in 22 cases of torsioned cystic ovarian mass, benign teratoma(n=21), and normal ovary (n=l) confirmed surgically on pathologically. We classified the ovarian mass into two groups as sonographic ally cystic (n=15) or non-cystic mass(n=6). The patients were 17-72 years old(mean:36.9). We retrospectively reviewed US examination with respect to (1) free fluid in Douglas pouch, (2)pelvic mass & mass wall thickening, (3)dilated uterine tube, (4)prominent follicles, (5) engorged vessels, and (6)beak-like echo in torsion site. The combined conditions of torsion were uterine myoma(n=l) and intrauterine pregnancy(n=3). RESULTS: In sonogram, sonographic cystic mass (n=15) group showed (1)free fluid in Douglas pouch (9/15), (2)mass wall thickening(6/15), (3)dilated uterine tube(2/15), and sonographic non-cystic mass(n=6) group showed (1) free fluid in Douglas pouch (3/6). In sonogram, torsion of the normal ovary(n=1) showed (1) free fluid in Douglas pouch, and (2) prominent follicles. CONCLUSION: If sonogram of reproductive aged women with acute abdomen show free fluid in Douglas pouch and pelvic mass with wall thickening, ovarian mass torsion is suggested. But clinical features of acute abdomen and clinical diagnosis of torsion are more important than sonographic features.
Abdomen, Acute ; Diagnosis ; Douglas' Pouch ; Fallopian Tubes ; Female ; Humans ; Ovary ; Retrospective Studies ; Ultrasonography*

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