• 제목, 요약, 키워드: Contrast medium

검색결과 488건 처리시간 0.082초

CT 조영제가 MR 조영제의 이완율에 미치는 영향 (Effects of CT Contrast Medium on the Relaxation Rate of MR Contrast Medium)

  • 권순용;강충환;정현근;박진서;김성호
    • 대한방사선기술학회지:방사선기술과학
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    • v.41 no.2
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    • pp.103-107
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    • 2018
  • In MR, the iodine CT contrast medium reduces the T1 and T2 relaxation times of the substance, resulting in a change in signal intensity. This study aimed to measure the relaxation rate of MR contrast medium with or without diluting CT contrast medium and analyzed the effect of CT contrast medium. Undiluted Gadoteridol solution was diluted with saline to prepare MR contrast medium phantoms with various levels of Gadoteridol concentrations. Moreover, undiluted Iomeprol was mixed with the prepared MR contrast medium phantoms at 1:1 ratio to make MR contrast medium phantoms with containing CT contrast medium for the experiment. T1 and T2 mappings were conducted to quantitatively evaluate the relaxation time and relaxation rate of these phantoms. The results showed that the T1 and T2 relaxation time and relaxation rate of MR contrast medium diluted with CT contrast medium were significantly (p<0.05) shorter than those of MR contrast medium not diluted with CT contrast medium. The results of this study imply that, when MR contrast medium shall be used after injecting CT contrast medium, CT contrast medium should be discharged enough. Moreover, it would be desirable to conduct CT test after taking MRI test in order to reduce the effects of CT contrast medium on MR contrast medium.

How Computed Tomography Contrast Media and Magnetic Resonance Imaging Contrast Media Affect the Changes of Uptake Counts of 201Tl

  • Lee, Jin-Hyeok;Lee, Hae-Kag;Cho, Jae-Hwan;Cheon, Miju
    • Journal of Magnetics
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    • v.19 no.4
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    • pp.372-377
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    • 2014
  • The purpose of the study is to investigate how uptake counts of $^{201}Tl$ of radioisotopes in the human body could change, when taking computed tomography and magnetic resonance imaging right after injecting contrast media. $^{201}Tl$ radioisotope substances of iodine contrast medium, which is a computed tomography contrast medium, and paramagnetic contrast medium, which is an magnetic resonance imaging contrast medium, were used as study materials. First, $^{201}Tl$ was put into 4 cc of normal saline in test tube, and then a computed tomography contrast medium of Iopamidol$^{(R)}$ or Dotarem$^{(R)}$, was put into 2 cc of normal saline in test tube. An magnetic resonance imaging contrast medium of Primovist$^{(R)}$ or Gadovist$^{(R)}$ was also put into 2 cc of normal saline in test tube. Each contrast medium was distributed to make $^{201}Tl$ as 3 mCi, with a total of 4 cc. Gamma camera, low energy high resolution collimator, and pinhole collimator were used to obtain images. The uptake count of $^{201}Tl$ was measured with 1000 frames of images, and obtained after 10 times of repetition. This study revealed that the use of Gadovist$^{(R)}$, which is an magnetic resonance imaging contrast medium, showed the smallest number of uptake count, after measuring $^{201}Tl$ uptake count by low energy high resolution collimator. On the other hand, the use of Iopamidol$^{(R)}$, which is a computed tomography contrast medium, showed the biggest difference in uptake count, when measuring $^{99m}Tc$ uptake count by Pinhole collimator. When examining with gamma camera, using contrast medium and $^{201}Tl$, identifying the changes of uptake count is very important for improving the value of diagnosis.

Analysis of thoracic epidurography and correlating factors affecting the extent of contrast medium spread

  • Hong, Ji Hee;Oh, Jung Hue;Park, Ki Bum
    • The Korean Journal of Pain
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    • v.29 no.4
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    • pp.255-261
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    • 2016
  • Background: Thoracic epidural anesthesia is frequently used to maintain intraoperative and postoperative analgesia. Frequently, 3 ml of local anesthetic is used as a test dose, or for intermittent epidural injection. We assessed the extent of the spread of 3 ml of contrast medium in the thoracic epidural space and attempted to identify any correlating factors affecting the epidurography. Methods: A total of 70 patients were enrolled in the study, and thoracic epidural catheterizations were performed under fluoroscopic guidance. Using 3 ml of contrast medium, epidurography was evaluated to confirm the number of spinal segments covered by the contrast medium. Correlation analysis was performed between patient characteristics (sex, age, body mass index, weight, height, and location of catheter tip) and the extent of the contrast spread. Results: The mean number of vertebral segments evaluated by contrast medium was $7.9{\pm}2.2$ using 3 ml of contrast medium. The contrast spread in the cranial direction showed more extensive distribution than that in the caudal direction, with statistical significance (P < 0.01). Patient height demonstrated a negative correlation with the extent of distribution of contrast medium (r = -0.311, P < 0.05). Conclusions: Thoracic epidurography using 3 ml of contrast medium results in coverage of a mean of $7.9{\pm}2.2$ spinal segments, with more extensive cranial spread, and patient height showed a weak negative correlation with the distribution of contrast medium.

방사선 검사에 사용되는 조영제 Iopamidol의 안전성 평가 (Safety Evaluation of Iopamidol Contrast Medium Used for Radiological Examination of a Local Clinic in Korea)

  • 박창묵;이보름;송태범;장제관;이유정;이명구;임성실
    • 약학회지
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    • v.53 no.6
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    • pp.328-333
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    • 2009
  • Contrast media are substances that are used to enhance the contrast of structures or fluids within the body in medical imaging. Those are commonly used to enhance the visibility of blood vessels and the gastrointestinal tract. The aim of this study is to evaluate patients who got injected iopamidol, developed as one of contrast medium regarding changes in cardiovascular system and especially, adverse drug reactions. This study were performed on randomly selected a total of 51 patients (range of 15~85 years old) who got injected contrast medium, Iopamidol at a P hospital in Gyeonggi province from September 22nd, 2008 to January 24th, 2009. Data were collected by questionnaire though person to person. We analyzed the data by SPSS (Version 12. for windows). Methods of analysis were frequency and cross analysis. In results, 19.6% (n=10) were founded for adverse drug reactions of contrast medium. 25.0% (n=4) of 10 patients who had adverse drug reactions of contrast medium had took abdomen contrast test. 2 patients of those took contrast test for chest. Also, 3.9% (n=2) patients felt vomiting and nausea after injection of contrast medium. In conclusion, 19.6% patients experienced adverse drug reaction of contrast medium. Therefore, when taking radiation test, we should make efforts to minimize adverse drug reactions to achieve suitable and effective treatment.

Preliminary study on contrast flow analysis of thoracic transforaminal epidural block

  • Hong, Ji Hee;Noh, Kyoung Min;Park, Ki Bum
    • The Korean Journal of Pain
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    • v.31 no.2
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    • pp.125-131
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    • 2018
  • Background: The thoracic transforaminal epidural block (TTFEB) is usually performed to treat herpes zoster or postherpetic neuralgia (PHN). Especially, multiple segmental involvements and approximate contrast medium spread range, according to volume, help to choose the proper drug volume in the transforaminal epidural block. This study investigated the contrast medium spread patterns of 1-ml to 3-ml TTFEBs. Methods: A total of 26 patients with herpes zoster or PHN were enrolled in this study. All participants received 1 ml, 2 ml, or 3 ml of contrast medium. Results were divided into Groups A, B and C based on the volume (1, 2, or 3 ml), with n = 26 for each group. After the injection of contrast medium, the spread levels were estimated in both the lateral and anteroposterior (AP) images using fluoroscopy. Results: The cephalad spread of contrast medium in the lateral image as expressed by the median (interquartile range) was 2.00 levels (1.00-2.00) for Group A, 2.50 (2.00-3.00) for Group B, and 3.00 (2.00-4.00) for Group C. The caudal spread level of contrast medium was 1.00 (1.00-2.00) for Group A, 2.00 (2.00-3.00) for Group B, and 2.00 (2.00-3.00) for Group C. There was ventral and dorsal spread of the 3-ml contrast medium injection in 88% (23/26) of cases in the lateral image. Conclusions: Injection of 3 ml of contrast medium through the foramina spread 6 levels in a cephalocaudal direction. Spread patterns revealed a cephalad preference. TTFEB resulted in dorsal and ventral spread in a high percentage of cases. This procedure may be useful for transferring drugs to the dorsal and ventral roots.

CT 조영제 혈관외유출의 방사선학적 고찰 (Radiological Evaluation of CT Contrast Medium Extravasation)

  • 권대철;박창희;정재호;강희두;송은홍
    • 대한디지털의료영상학회논문지
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    • v.10 no.2
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    • pp.39-49
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    • 2008
  • Extravasation of contrast material is a not infrequent complication of enhanced imaging studies and large volume extravasation may result in severe damage. Subcutaneous extravasation of the radiographic contrast medium is one of the complications of the contrast medium-enhanced procedures. Automated power injectors enable the contrast material to be delivered at a uniform high-flow-rate and as a nonfragmented bolus, and this is essential for many contrast material enhanced CT(computed tomography) applications. The major risk associated with the use of automated power injectors is the well known complication of contrast material extravasation at the injection site. Automated injection of CT contrast material can produce the compartment syndrome. Selection of the nonionic contrast material after careful evaluation of the intravenous administration site and monitoring of the patient during the use of a mechanical power injector may help minimize or prevent extravasation injuries. Early identification is important and conservative management is effective in most cases. Prevention of these injuries with the education of radiological technologist remains the ultimate aim.

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조영증강검사 시 생체 요인을 이용한 조영제 peak time에 관한 연구 (A study of contrast agent peak time using biomechanics factors experimental contrast medium infusion test using at contrast enhanced magnetic resonance angiography)

  • 손순룡;김윤신;최관우;서성미;민정환;유병규;이종석
    • 한국산학기술학회논문지
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    • v.14 no.2
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    • pp.786-792
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    • 2013
  • 본 연구는 조영제 peak time에 영향을 주는 주된 생체 요인를 분석하여 검사에 적용함으로써 추가적인 조영제 주입에 따른 부작용을 최소화 하고 고해상도의 혈관영상을 유지하는 방안을 모색하고자 하였다. 시험적조영제주입법을 이용한 48명의 환자를 대상으로, 검사 전과 검사 중 환자의 생체 요인을 측정한 후, 조영제 peak time과 상관관계를 알아보고, 회귀식을 이용해 산출한 조영제 peak time이 측정된 조영제 peak time과 일치하는지 Bland-Altman plot를 통해 평가하였다. 연구결과, 검사 시 최저혈압과 심박동수가 조영제 peak time과 유의한 음의 상관관계를 보였고, 1단계 증가할 때마다 평균적으로 조영제 peak time은 -0.018과 -0.159로 유의하게 감소하였으며, 일치도가 상당히 높아 두 방법의 차이가 없음을 알 수 있다. 결론적으로 본 연구의 회귀식을 이용하면 우수한 화질을 유지하면서 환자에게 투여되는 조영제 사용량을 줄일 수 있어 기존의 방법을 대체할 수 있으리라 사료된다.

뇌 혈관검사 시 적정 조영제량에 관한 연구 (A Study on the Optimum Amount of Contrast Media in Brain Angiography)

  • 김규형;이상호
    • 대한방사선기술학회지:방사선기술과학
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    • v.41 no.2
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    • pp.123-128
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    • 2018
  • Recently, the use of contrast agents has been increasing as a broader range of tests and dynamic tests have become common due to the development of equipment and imaging techniques such as Multi-Detector CT. However, the side effects of using contrast agents have been reduced by the development of non-ionic contrast agents, but they are still occurring often. The purpose of this study was to propose a method to minimize the side effect of contrast agent by using the amount of contrast agent injected to the brain angiography test to suppress excessive use of contrast agent and analyze the amount of contrast agent. Patients who were prescribed Brain Angiography due to cerebrovascular disease, According to the results of the comparison of the results obtained by dividing into 4 groups of 10ml each according to the amount of contrast medium injected with contrast agent according to the BMI of the patient, BA and SNR were not different between groups, and even if the amount of contrast injection was reduced, there was no problem in the evaluation of CT angiography through 3D reconstruction. This result shows that even if the contrast medium is injected into the blood vessels of the patient first and then the contrast medium is used as the physiological saline solution, the contrast medium is reduced by 40% it can be expected to minimize.

Oral contrast media for computed tomography of canine pancreas

  • Choi, Jihye;Chang, Jinhwa;Oh, Sunkyoung;Yoon, Junghee
    • 대한수의학회지
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    • v.51 no.2
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    • pp.165-169
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    • 2011
  • Barium suspension, oral iodine contrast medium and water were applied in eight dogs to evaluate (1) distension of gastrointestinal tract, (2) the effect of the oral contrast media on the identification of the pancreas from surrounding organs, and (3) image quality and the presence of artifacts in canine pancreas computed tomography (CT) images. Oral iodine contrast medium, gastrografin, produced significant artifacts that deteriorated the CT images of the pancreas. The use of water did not provide the fullness of the gastrointestinal lumens. Barium suspension was effective for the identification of the pancreas from the surrounding gastrointestinal tract, without significantly increasing image noise. Barium suspension can be used as an optimal contrast medium that will not cause an adverse effect on the pancreatic density and image quality.

경정맥 조영제 주입시 혈관 및 간실질의 조영증강에 영향을 미치는 외부적 인자에 관한 연구 (A Study of Influencing Factors in the Effectiveness of Vascular and Hepatic Parenchyma Enhancement During Intravenous Injection of Contrast Medium)

  • 한동현;장근조
    • 대한방사선협회지
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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

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