• Title/Summary/Keyword: Color Doppler sonography

Search Result 7, Processing Time 0.024 seconds

Usefulness of Twinkling Artifacts in Color Doppler Ultrasonography (컬러 도플러 초음파에서 Twinkling artifacts의 유용성)

  • Sim, Hyun-Sun;Kwon, Kyung-Tae
    • The Journal of the Korea Contents Association
    • /
    • v.16 no.10
    • /
    • pp.291-298
    • /
    • 2016
  • The aim of the study was to investigate the diagnostic value of the color Doppler twinkling artifact in disease of urinary system. The intensity of twinkling artifact(TA) with color Doppler was classified into 3 levels, 0(non-TA) to 3(distinct TA). In the in vitro study, acorn jelly with various materials on top was examined using color Doppler at B-mode sonography in a water bath for TA. 31 patients with diagnosis of urinary calculi(renal stones 16, urinary stones 15) based on B-mode sonography were studied in vivo for TA. The materials with rough surfaces such as salt, screw and cubics at B-mode sonography with color Doppler contributed to causing TA. At B-mode sonography without color Doppler 37% of renal stones and 60% of ureter stones were detected. but at B-mode sonography with color Doppler TA was demonstrated for all cases. Superficial roughness of materials affected occurrence of TA at B-mode sonography with color Doppler. Therefore, TA at B-mode sonography without color Doppler could play a role in confident diagnosis of the disease of urinary system.

Automatic Extraction of Blood Flow Area in Brachial Artery for Suspicious Hypertension Patients from Color Doppler Sonography with Fuzzy C-Means Clustering

  • Kim, Kwang Baek;Song, Doo Heon;Yun, Sang-Seok
    • Journal of information and communication convergence engineering
    • /
    • v.16 no.4
    • /
    • pp.258-263
    • /
    • 2018
  • Color Doppler sonography is a useful tool for examining blood flow and related indices. However, it should be done by well-trained operator, that is, operator subjectivity exists. In this paper, we propose an automatic blood flow area extraction method from brachial artery that would be an essential building block of computer aided color Doppler analyzer. Specifically, our concern is to examine hypertension suspicious (prehypertension) patients who might develop their symptoms to established hypertension in the future. The proposed method uses fuzzy C-means clustering as quantization engine with careful seeding of the number of clusters from histogram analysis. The experiment verifies that the proposed method is feasible in that the successful extraction rates are 96% (successful in 48 out of 50 test cases) and demonstrated better performance than K-means based method in specificity and sensitivity analysis but the proposed method should be further refined as the retrospective analysis pointed out.

Visualization of the Origin of the Vertebral Arteries with Color Doppler Sonography (색도플러 초음파검사에 의한 경추골동맥 기시부 관찰)

  • Yoon, Seok-Hwan;Lee, Won-Hong;Lee, Dae-Hyung
    • Journal of radiological science and technology
    • /
    • v.32 no.1
    • /
    • pp.87-93
    • /
    • 2009
  • Background/aim : Atherosclerotic disease at the origin of the vertebral arteries is one of the risk factors for vertebrobasilar ischemic disease. Assessment and visualization of the origin of the vertebral arteries with color doppler sonography is a non-trivial task. The aim of this study is to increase the visualization rate of the origin of the vertebral arteries with color doppler sonography. Materials and Methods : Color doppler sonography for the vertebral arteries included carotid arteries was performed to 198 patients. We first examined the vertebral artery in the upper neck in the direction of the subclavian artery to distinguish its origin more easily. If the vertebral artery origin was not visualized in natural position, the examiner pushed the transducer toward a clavicle or pushed the shoulder of patient by the other hand. The technical methods for visualization of the vertebral artery origin were classified into three grades: natural position, pushing the transducer, and pushing the shoulder of patient according to the depth (3.0 cm and shallower, deeper than 3.0 cm) of the origin. Results : The origin of the vertebral arteries could be visualized in 97% on the right and in 92% on the left. The origin of the vertebral arteries could be visualized in 98.6%, 1.4%, and 0.0% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at shallower than 3.0 cm on the right side. The origin of the vertebral arteries could be visualized in 81.2%, 14.6%, and 4.2% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at deeper than 3.0 cm on the right side. The origin of the vertebral arteries could be visualized in 85.4%, 10.7%, and 3.9% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at shallower than 3.0 cm on the left side. The origin of the vertebral arteries could be visualized in 55.7%, 30.4%, and 13.9% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at deeper than 3.0 cm on the left side. Conclusion : If the examiner pushes the transducer toward a clavicle or pushes the shoulder of patient by the other hand, when the vertebral artery origin during the color doppler sonography is not visualized in natural position, visualization rate of the origin of the both vertebral arteries is increased.

  • PDF

Incidence of Deep Vein Thrombosis before Hip Fracture Surgery Diagnosed by Color Doppler Sonography Surveillance (고관절 주위 골절환자에서 술 전 색 도플러 초음파를 이용하여 진단한 심부 정맥 혈전의 빈도)

  • Jung, Jae-Hoon;Lee, Kyung-Jae;Min, Byung-Woo;Son, Eun-Seok;Koo, Tae-Won
    • The Journal of Korean Orthopaedic Ultrasound Society
    • /
    • v.7 no.2
    • /
    • pp.98-104
    • /
    • 2014
  • Purpose: To evaluate the incidence of deep vein thrombosis (DVT) before hip fracture by duplex color Doppler ultrasonography. Materials and Methods: From June 2013 to May 2014, 27 patients who had agreed to perform color Doppler ultrasonography before hip fracture surgery were evaluated for the incidence of DVT. Patients who had history of DVT were excluded. Five patients were men and 19 patients were women. The mean age was 74.3 years old (41-87). There were 15 cases of femoral neck fracture, 11 cases of intertrochanteric fractures and one case of acetabular fracture. Surgical intervention underwent within 48 hours from admission and duplex color Doppler ultrasonography was carried out at the day of admission. Results: DVT occurred in six cases (22.2%). Four cases (14.8%) occurred in proximal deep vein and two cases (7.4%) occurred in distal deep vein. The mean period of immobilization was longer in patients who had DVT. But there was no significant difference. The mean age was 79 years old (75-87) in patients who had DVT and 72 years old (65-86) in patients who had not. There was significant difference (p=0.038). Conclusion: The incidence of DVT which was diagnosed by duplex color Doppler ultrasonography before hip fracture surgery was relatively high (22.2%). So it is necessary to undergo duplex color Doppler ultrasonography more aggressively to rule out DVT before hip fracture surgery.

  • PDF

Peroneal Artery Perforator-Based Propeller Flaps for Reconstruction of Soft Tissue Defect around the Ankle Joint: A Report of Four Cases (비골 동맥 천공지 기저 프로펠러 피판술을 이용한 족관절 주위 연부조직 결손의 재건술: 4예 보고)

  • Cho, Byung-Ki;Park, Ji-Kang;Park, Kyoung-Jin;Chong, Suri
    • Journal of Korean Foot and Ankle Society
    • /
    • v.18 no.4
    • /
    • pp.222-226
    • /
    • 2014
  • Four patients with soft tissue defects around the ankle joint were covered with peroneal artery perforator-based propeller flaps. Using color Doppler sonography, the flap was designed by considering the location of the perforator and soft tissue defects. The procedure was then performed by rotating the flap by $180^{\circ}$. Additional skin graft was required in a patient due to partial necrosis, and delayed wound repair was performed in another patient with poor blood circulation at the distal part of the flap. The remaining patients did not have any complications and results were considered excellent. Good outcomes were eventually obtained for all patients.

Usefulness of External Monitoring Flap in the Buried Jejunal Free Flap (유리 공장 피판술 후 외부 감시 피판의 유용성)

  • Kim, Baek Kyu;Chang, Hak;Minn, Kyung Won;Hong, Joon Pio;Koh, Kyung Suck
    • Archives of Plastic Surgery
    • /
    • v.34 no.4
    • /
    • pp.432-435
    • /
    • 2007
  • Purpose: The jejunal free flap has the shorter ischemic time than other flap and requires a laparotomy to harvest it. As the evaluation of the perfusion the buried flap is very important, the perfusion of the buried jejunal free flap requires monitoring for its salvage. We tried to improve the monitoring flap method in the jejunal free flap and examined its usefulness. Methods: From March 2002 to March 2006, the monitoring flap method was applied to 4 cases in 8 jejunal free flaps for the pharyngeal and cervical esophageal reconstructions. The distal part of the jejunal flap was exposed without suture fixation through cervical wound for monitoring its perfusion. The status of perfusion was judged by the color change of jejunal mucosa and mesentery. If necessary, pin prick test was performed. Doppler sonography was applied to mesenteric pedicle of the monitoring flap in case of suspicious abnormal circulation. Results: The monitoring flap shows no change in 3 cases, but the congestion happened in one case at the 12 hours after the operation. This congestion was caused by the twisting or kinking of the mesenteric pedicle of the monitoring flap. So, we fixed up the monitoring flap close to adjacent cervical skin for prevention of rotation. Finally, the main part of transferred jejunal flap was intact. Conclusion: The success of a jejunal free flap depends on close postoperative monitoring and early detection of vascular compromise. So, various monitoring methods have been tried, for instance, direct visualization using a fiberoptic pharyngoscope, through a Silastic window placed in the neck flap, or external surface monitoring with an Doppler sonography, use of a buried monitoring probe. But, all of the above have their own shortcomings of simplicity, non-invasiveness, reliability and etc. In our experience, monitoring flap can be a accurate and reliable method.

A Case of Neck Soft Tissue Infection in Patient with Nasopharyngeal Cancer; Misdiagnosed as Local Progression during External Radiotherapy (비인두암 환자에서 방사선 치료중 암의 국소진행으로 오인된 경부 연조직 감염 1례)

  • Lee So-Yeon;Im So-Hi;Choi Hyun-Cheul;Kim Sung-Hwan;Jun Jung-Soo;Back Joon-Hyun;Yoo Jin-Young;Noh He-Il;Kim Hoon-Kyo
    • Korean Journal of Head & Neck Oncology
    • /
    • v.18 no.2
    • /
    • pp.216-218
    • /
    • 2002
  • A 38-year-old man, who was diagnosed nasopharyngeal carcinoma (stage T4N2Mx) had rapidly growing lower neck mass (at level IV area) with local inflammation sign during concurrent chemoradiotherapy. After we performed Color Doppler sonography and fine needle aspiration biopsy of the neck mass, we differentiated neck soft tissue infection from tumor extension. Size of the mass decreased after antibiotics therapy. It was difficult to differentiate neck infection from tumor progression during treatment in naspharyngeal carcinoma.