• 한국방사선학회논문지
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• 제17권5호
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• pp.751-759
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• 2023

유방 초음파 검사는 지방형 유방에서 영상화가 어렵고 미세 석회화를 찾는 데 어려움이 있지만, 미세 석회화의 발견은 유방암 선별 검사에 매우 중요하다. 초음파의 컬러 도플러 허상 중 반짝 허상은 영상에서 주로 결석이나 석회화 같은 강한 반사체에 발생되며 이를 이용한 평가 방법이 임상적으로 사용 중이다. 본 연구는 유방 석회화 중 가장 많이 차지하는 인산칼슘을 이용한 유방 모의 팬텀을 제작하여 초음파 장비의 컬러 도플러 설정 변수인 펄스 반복 주파수, 앙상블, 퍼시스트, 월 필터, 평활화, 선밀도, 임계값에 대해 실험을 진행했고 이를 통해 유방 초음파 검사에서 반짝 허상의 대조도를 개선하는 조건과 임상에서 이를 최대한 활용하기 위한 방안을 연구하고자 하였다. 그 결과 펄스 반복 주파수가 3.6 kHz ~ 7.2 kHz 범위에서 반짝 허상이 발생하며 10.5 kHz 이상에서는 발생하지 않았다. 앙상블의 경우 낮은 조건에서는 모든 크기의 석회화에 반짝 허상이 발생하였고 임계값 설정에서는 80에서 100 조건에서만 반짝 허상이 조금 증가했으며 1 mm 크기의 석회화에서는 발생하지 않았다. 퍼시스트, 월 필터, 평활화, 선밀도 설정은 반짝 허상이 발생하긴 했으나 조건별로 증가하지는 않아 설정 변수에 큰 의미가 없었으며 반짝 허상에 가장 큰 영향을 미친 것은 펄스 반복 주파수, 앙상블, 임계값으로 나타났다. 본 연구는 검사자가 컬러 도플러 설정을 조절하여 반짝 허상을 효과적으로 증가시키는 최적의 조건을 선택하는 데 도움이 될 것으로 사료된다.

• 대한정형외과 초음파학회지
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• 제7권2호
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• pp.98-104
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• 2014

목적: 고관절 주위 골절 환자에서 술 전 색 도플러 초음파 검사를 이용하여 심부 정맥 혈전증을 진단하고 그 발생 빈도를 알아 보고자 하였다. 대상 및 방법: 2013년 6월부터 2014년 5월까지 본원에 내원한 고관절 주위 골절 환자 중 이전에 심부 정맥 혈전의 과거력이 없으며 술 전 색 도플러 초음파 검사에 동의한 환자 27예를 대상으로 하였으며 남자가 8예, 여자가 19예이었다. 평균 연령은 74.3세(41-87)였다. 고관절 주위 골절의 진단명은 대퇴 경부 골절 15예, 대퇴 전자간 골절 11예, 비구 골절이 1예였다. 모든 수술은 본원 내원 후 48시간 이내에 시행하는 것을 원칙으로 하였으며 내원 24시간 이내에 색 도플러 초음파 검사를 시행하였다. 결과: 심부 정맥 혈전은 총 6예(22.2%)에서 발견되었다. 이중 2예(7.4%)는 근위 심부 정맥 혈전이었고 4예(14.8%)는 원위 심부 정맥 혈전이었다. 심부 정맥 혈전 발생 군이 평균 79세(75-87), 발생하지 않은 환자 군이 평균 72세(65-86)로 유의하게 많았다(p=0.038). 결론: 고관절 주위 골절 환자에게 수술 이전 실시한 색 도플러 초음파 검사상 22.2%로 비교적 높은 빈도로 심부 정맥 혈전이 발견되었다. 고관절 주위 골절 환자에서 술 전 심부 정맥 혈전증에 대한 보다 적극적인 검사가 필요할 것으로 사료된다.

• Journal of Yeungnam Medical Science
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• 제14권1호
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• pp.77-84
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• 1997

55명의 미숙아를 대상으로 이중 도플러 초음파 검사를 실시하여 대천문을 통한 전 뇌동맥의 혈류속도 및 혈류형태를 조사하였다. 미숙아에서 뇌 혈류속도 및 pulsatility index는 재태기간, 출생 체중, 및 미숙아의 나이 등의 증가에 따라 비례하여 증가하였으나 resistive index는 감소하였다. 뇌실 출혈이 있는 환아 군에서는 특징적인 resistive index의 증가가 보였지만 혈류속도 및 plusatility index는 불규칙하였다. 정상 미숙아의 뇌혈류 관찰 및 환아 군에서의 뇌혈류 검사에서 이중 도플러 초음파 검사는 비침습적이고 재현성도 뛰어나 선별검사로 유용한 방법이라고 생각한다.

• Tuberculosis and Respiratory Diseases
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• 제53권1호
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• pp.66-70
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• 2002

저자들은 반복적인 폐렴의 병력을 가지고 있는 여성에서 도플러초음파를 이용하여 하행복부대동맥으로부터 분리폐로 체동맥의 주행을 확인하여 폐분리증을 진단하고 이를 수술로 확인하였기에 문헌고찰과 함께 보고하는 바이다.

• Journal of Veterinary Science
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• 제21권3호
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• pp.21.1-21.14
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• 2020

Background: Physical exercise is known to cause significant joint changes. Thus, monitoring joint behavior of athletic horses is essential in early disorders recognition, allowing the proper management. Objectives: The aims of this study were to determine the morphological patterns, physical examination characteristics and ultrasound findings of show jumping horses in training and to establish a score-based examination model for physical and ultrasound follow-ups of metacarpophalangeal joint changes in these animals. Methods: A total of 52 metacarpophalangeal joints from 26 horses who were initially in the taming stage were evaluated, and the horses' athletic progression was monitored. The horses were evaluated by a physical examination and by B-mode and Doppler-mode ultrasound examinations, starting at time zero (T0), which occurred concomitantly with the beginning of training, and every 3 months thereafter for a follow-up period of 18 months. Results: The standardized examination model revealed an increase in the maximum joint flexion angles and higher scores on the physical and ultrasound examinations after scoring was performed by predefined assessment tools, especially between 3 and 6 months of evaluation, which was immediately after the horses started more intense training. The lameness score and the ultrasound examination score were slightly higher at the end of the study. Conclusions: The observed results were probably caused by the implementation of a training regimen and joint adaptation to physical conditioning. The joints most likely undergo a pre-osteoarthritic period due to work overload, which can manifest in a consistent or adaptive manner, as observed during this study. Thus, continuous monitoring of young athlete horses by physical and ultrasound examinations that can be scored is essential.

• Korean Journal of Radiology
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• 제1권4호
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• pp.191-197
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• 2000

Because US plays a key role in the initial evaluation of hepatic hemangiomas, knowledge of the entire spectrum of US appearances of these tumors is important. Most hemangiomas have a distinctive US appearance, and even with those with atypical appearances on conventional gray-scale US, specific diagnoses can be made using pulse-inversion harmonic US with contrast agents. In this essay, we review the spectrum of US appearances of hepatic hemangiomas on conventional gray-scale, power Doppler, and pulse-inversion harmonic US with contrast agents.

• 대한의생명과학회지
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• 제25권4호
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• pp.381-389
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• 2019

The physiological function test is the only patient contact area in the field of clinical laboratory. We need to recruit and encourage the experts due to requiring the expertise and long time for examination. However, there is currently no rule for estimating optimal workforce in the field of physiological function tests. The purpose of this study is to establish the basis of the studies for mid- to long-long term job creation in the field of ultrasound by evaluating the number of appropriate tests and appropriate workforce. We calculated the quantitative and qualitative workload for the number of appropriate tests and appropriate workforce using online questionnaire. All statistical analyses were performed using SPSS version 18.0 (SPSS Inc., Chicago, IL, USA). A total of 216 respondents were 48 (22.2%) male and 168 (77.8%) female. A total of 157 laboratories were 62 (39.5%) for echocardiography, 91 (58.0%) for the transcranial Doppler (TCD) and 4 (5.7%) for the carotid ultrasound. The mean number of appropriate tests was 10 ± 2 in the echocardiography, 9 ± 2 in TCD and 11 ± 2 in the carotid ultrasound. In addition, the number of laboratories required to recruit employees for appropriate workforce was 19 in echocardiography, 18 in TCD, and 0 in carotid ultrasound. The number of hospital required to recruit workforce were 7 primary hospitals, 22 secondary hospitals, 7 third hospitals. This study can be used as an important data as the first study at present time when the data on the workforce status and work environment of the ultrasonic laboratories is insufficient. Based on the quantitative and qualitative workloads, the number of appropriate tests and appropriate workforce can support mid- to long-long term job creation in the field of ultrasound.

• 대한치과의사협회지
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• 제55권11호
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• pp.778-788
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• 2017

Ultrasound sonography(US) is used to evaluate various diseases of oral and maxillofacial region including salivary glands, soft tissue and jaw lesions because of easy accessibility and no hazard of ionizing radiation. Also, US can offer dynamic study showing real-time images during diagnostic or surgical procedure. US images provide accurate information about the internal features of lesions on the jaw prior to surgical treatment. Doppler images are used to visualize the vascular distribution of the lesions and to provide additional information to enhance diagnostic value. It is necessary to evaluate the diagnostic value of US and evaluate its usefulness by looking at clinical cases using US images. Therefore, US imaging may be recommended as an assistant image in evaluating jaw lesions. US images provided accurate information about the internal structure of lesions on the jaw prior to surgical treatment, and diagnostic value was enhanced by visualizing the vascular distribution of the lesion using doppler imaging. We report the protocol and suggest the effectiveness of US for various lesions and US-guided sialography.

• 대한의용생체공학회:의공학회지
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• 제36권5호
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• pp.150-154
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• 2015

Long time ultrasound scan can cause a temperature rise in human tissue and affect the physical body. This is closely connected with patients' safety. So many researchers have been studied on this matter with animals such as mammals and experimental rat, because diagnostic ultrasound has been used many types of human organ to find disease. Therefore, this study is tested on bean sprouts to search how far the tissue temperature changes because of the excessive scanning consequence from ultrasound diagnosis and frequent number of ultrasonic scanning and how much affect their growth. The United States and several European countries have restrictions for number of scanning, while South Korea does not have any limitation for using ultrasound diagnosis. Comparison was that how different condition affect its' growing. The testing group is like many pregnancy moms to have 50 minutes in B-mode and color doppler mode by linear, convex and sector probe every day for a week and the other is to scan only once during the testing period. As a result, it was confirmed that there was a significant growing difference on frequent ultrasonic scanning group compared to normal one. So the final conclusion is that there needs to have a significant limitation of ultrasound scan time and a number of inspection when having for diagnostic ultrasound and recommendation like USA and a few European countries.

• Journal of Animal Science and Technology
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• 제65권2호
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• pp.365-376
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• 2023

Pig breeding management directly contributes to the profitability of pig farms, and pregnancy diagnosis is an important factor in breeding management. Therefore, the need to diagnose pregnancy in sows is emphasized, and various studies have been conducted in this area. We propose a computer-aided diagnosis system to assist livestock farmers to diagnose sow pregnancy through ultrasound. Methods for diagnosing pregnancy in sows through ultrasound include the Doppler method, which measures the heart rate and pulse status, and the echo method, which diagnoses by amplitude depth technique. We propose a method that uses deep learning algorithms on ultrasonography, which is part of the echo method. As deep learning-based classification algorithms, Inception-v4, Xception, and EfficientNetV2 were used and compared to find the optimal algorithm for pregnancy diagnosis in sows. Gaussian and speckle noises were added to the ultrasound images according to the characteristics of the ultrasonography, which is easily affected by noise from the surrounding environments. Both the original and noise added ultrasound images of sows were tested together to determine the suitability of the proposed method on farms. The pregnancy diagnosis performance on the original ultrasound images achieved 0.99 in accuracy in the highest case and on the ultrasound images with noises, the performance achieved 0.98 in accuracy. The diagnosis performance achieved 0.96 in accuracy even when the intensity of noise was strong, proving its robustness against noise.