• Title, Summary, Keyword: 조영제

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Usefulness of Reverse Flow Prevention Valves for Back-flow Prevention of Gadolinium Based Contrast Agent in Dynamic Examination of Magnetic Resonance Imaging (자기공명영상 동적검사 시 조영제 역류방지용 밸브의 유용성)

  • Son, Soon-Yong
    • The Journal of the Korea Contents Association
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    • v.20 no.6
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    • pp.439-444
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    • 2020
  • The purpose of this study is to seek an alternative method to prevent the contamination of normal saline caused by the back-flow of Gadolinium Based Contrast Agent(GBCA) by the use of auto-injector for dynamic MRI. The research method is to manufacture the non-return valve as an alternative to the existing, and to examine the usefulness of the normal saline by dividing the state of normal saline into three groups. The signal intensity were compared. As a result, there was no statistically significant difference between normal saline before injection of group 1 and group 3 non-return valve (p> 0.05). It is analyzed that the self-produced non-return valve completely blocked the GBCA back to normal saline when the GBCA was injected. In conclusion, the application of the non-return valve presented in this study for dynamic MRI imaging using the auto injector can prevent normal saline contamination due to GBCA back-flow.

The Precaution Duty and the Product Liability for Adverse Reactions to the Contrast Media (조영제 부작용에 대한 주의의무와 제조물책임)

  • Kang, Yeong-Han
    • Journal of radiological science and technology
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    • v.30 no.4
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    • pp.305-311
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    • 2007
  • Contrast medium is a useful drug for radiological examinations and usability of it gradually increases while it has some inevitable adverse reaction and it is difficult to predict the occurrence and the degree of adverse reactions. Although the patient consented permission for the use of contrast media, the hospital could not be exempted from the responsibility for the adverse contrast media reaction. During radiological contrast media examination, the radiologist and the contrast media producer have the duty of precaution, prediction and avoid adverse results. In addition, they have reliabi lity of patient remedy for neglecting the duty. Since contrast medium are manufactured or processed as movable properties, the manufacturers are bound to the product liability if damages occur due to the defects in pharmaceuticals. In consideration of the characteristics of product liability, it is necessary to demand high degree of duty of care and diligence from producer or to reduce patient's burden of proof in a product liability lawsuit. For securing compensation ability and liability implementation, products compensation liability insurance is required for contrast medium manufacturers. In conclusion, contrast medium producer has legal liability for adverse reactions and the contract concluded with producer and hospital including legal liability will reduce liability of hospital and radiologist, patient.

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Syringe Reuse Issues in Automated Contrast Injection System in Dynamic Magnetic Resonance Imaging (조영제 자동주입기를 활용한 자기공명영상 동적검사 시 실린지 재사용의 문제)

  • Son, Soon-Yong
    • The Journal of the Korea Contents Association
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    • v.19 no.11
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    • pp.445-450
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    • 2019
  • This study proves that syringe reuse of automated injection system entails a risk of contrast media reflux and saline solution contamination which are pumped by a piston into the patients' venous cannula in the dynamic MR images, we will be aware of the serious problem. To quantify the contrast media contamination effect on the saline solution, identical volume of the saline solution was collected before and after the contrast injection to the patients' venous cannula following T1 weighted image scanning to verify whether signal intensities differences are observed. The signal intensity of saline solution after the contrast injection was significantly higher than that of saline before injection by 523.43%. This result is due to the backflow that contaminates the saline solution on the opposite side when the contrast agent is injected. In conclusion, the syringe used to inject contrast medium. causes cross-contamination due to contrast reflux. Therefore, even if the same patient's examination is used for quantitative analysis, the error should be avoided by changing the acquisition sequence or replacing the syringe.

A Study of The Correlation of The Area Dose with Residual CT Contrast Media and MRI Contrast Media during The Use of General Imaging Automatic Exposure Control System (일반촬영 자동노출제어장치 사용 시 잔존 CT 조영제와 MRI 조영제에 따른 면적선량의 상관성 연구)

  • Hong, Chan-Woo;Park, Jin-Hun;Lee, Jung-Min;Seo, Young-Deuk
    • Journal of the Korean Society of Radiology
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    • v.10 no.8
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    • pp.619-627
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    • 2016
  • The purpose of this study is to investigate the effect of CT contrast agent and MRI contrast agent on the area dose in the body when using automatic exposure control system in general radiography. After making rectangular holes in the center of the abdominal thickness paraffin phantom, CT contrast agent and MRI contrast agent were respectively diluted with physiological saline solution for contrast medium dilution ratio of 10:0, 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8, 1:9, 0:10%. Each experiment was set to 78 kVp, 320 mA, which is the proper condition for KUB photography, and thereafter a total of 30 inspections were made for each dilution ratio using an automatic exposure control device, and the area dose corresponding to the dilution ratio of each contrast agent, Average comparison and correlation analysis were performed on the exposure index. As a result, the CT contrast agent and the MRI contrast agent appeared different in area dose according to the dilution ratio(p<0.05), and as the dilution ratio increased, the area dose increased for CT contrast agent and MRI contrast agent(P<0.05). In each test, the exposure index showed the manufacturer's recommendation of 200-800 EI value, and the exposure index and area dose increased as the area dose increased(p<0.05). In conclusion, CT contrast agent and MRI contrast agent confirmed to increase the area dose by general imaging test using all automatic exposure control device. Therefore, it is considered that it is necessary to perform it after the contrast medium has been excreted sufficiently when using usual imaging test after using the contrast agent in CT and MRI examination.

Quantitative Comparison of 1H-MRS Spectra Depending on the Paramagnetic Gadolinium Contrast Agent(GBCA) Injection (가돌리늄 조영제 주입에 따른 1H-MRS spectrum의 정량적 비교)

  • Choi, Kwan-Woo;Son, Soon-Yong;Yoo, Beong-Gyu
    • Journal of the Korean Society of Radiology
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    • v.11 no.7
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    • pp.589-595
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    • 2017
  • This study evaluated the effect of gadolinium contrast agents on the spectrum of metabolites during $^1H-MRS$ of brain and to investigate whether the contrast agents injected before MR spectroscopy significantly affect the estimated peaks of MRS. From January to May 2017, brain MR spectroscopy was performed on 30 patients to compare the spectrum before and after contrast injection of the brain white matter tissue. As a result, the spectrum of metabolites decreased after the paramagnetic contrast agents injected. However, it was not statistically significant which indicated that the use of contrast agent did not meaningfully affect the spectrum of metabolites. In conclusion, the use of the paramagnetic contrast before the acquisition of the spectroscopy may aid voxel positioning especially when it is difficult to determine the exact location of the lesion or the contrast is low.

The Frontiers of Product Liability for Adverse Reactions to the Contrast Medium (조영제부작용에 대한 제조물책임의 한계)

  • Lim, Chang-Seon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.5
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    • pp.1386-1391
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    • 2008
  • The Korean Product Liability Act established the principle that a manufacturer has a duty to take care of a person who is not the customer who bought the product for him. In this instance, there is a duty to the patient for whom the product was purchased by the hospital from the pharmaceutical company. Therefore, the pharmaceutical company has the product liability for adverse reactions to the contrast medium. But the possibility for the patient to successfully sue the pharmaceutical company is quite low, because the patient needs to prove that a "defect" in the unsafe product was the cause of his injuries. And the physician or the radiological technologist can not reduce his liability risks based on the Product Liability Act. On the contrary, The has the product liability because diluting contrast medium belongs to the product category.

Changing mask timing reduces venous contamination in contrast enhanced MR Angiography of the head and neck (조영제 사용 후 혈관조영영상 획득 시, mask 영상의 획득 시점에 따른 정맥 신호의 감소)

  • Lee, ho-beom;Chung, mi-ae
    • Proceedings of the Korea Contents Association Conference
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    • pp.385-386
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    • 2017
  • 진단을 위해 조영제를 연속해서 사용하는 검사는, 첫 번째 주입으로 인해 조영제가 영상에 미치는 효과를 고려해야 한다. 본 연구에서는 mask 영상의 획득 시점을 통해 이를 개선하고자, 관류영상 획득 후 조영영상을 감산하는 새로운 방법을 제시하여, 혈관 겹침의 원인이 정맥의 신호강도를 유의하게 감소시켰다. 따라서, 본 연구의 방법을 이용하면, 복잡한 재구성이나 추가적인 기법 없이도, 효율적으로 정맥신호를 제거 할 수 있어 유용하리라 사료된다.

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Z-Score를 이용한 관류영상과 조영전후 감산에 의한 역동영상의 뇌관류 양상의 비교 관찰

  • 최순섭;오종영;남경진;이영일
    • Proceedings of the KSMRM Conference
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    • pp.171-171
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    • 2001
  • 목적: 뇌 자기공명영상에서 Z-score를 이용한 관류 영상과 조영전후의 감산에 의한 역동 영상의 관류 양상을 비교 관찰 하고자 한다. 대상 및 방법: 뇌 자기공명영상에서 이상 소견이 없는 젊은 환자 1명, Moya moya 환자 1, 중대뇌동맥 폐색 환자 1명, 외상후 증후군 1명, 뇌종양 1예를 대상으로 하여, 뇌의 routine 자기공명 영상과 함께 Gd-DTPA 0.1 mmol/kg를 급속 주사 후 자화율 대조 EPI 영상을 얻었다. 영상 기기는 Magnetom Vision(Siemens Medical Systems, Erlangen, Germany)이며, EPI 영상 지표들은 TR/TE는 0.8/29 msec, slice 두께 6 mm, slice 수 10, 화소수 128 $\times$ 128, FOV 215 $\times$ 215 mm, 영상획득 1 회, 1회 검사시간 1.32 초, 검사수 30 회로서, 총 검사시간은 40 초였다. 검사 후 영상처리(post processing)는 Magnetom Vision의 VB31D 자체 프로그램을 이용하였는데, 2-score를 이용한 관류영상은 조영제 유입전 영상들, 조영제 최대 유입기 영상들, 그리고 조영제 배출기 영상들 4-5 회를 각각 한 군으로 하여, Z-score 1.2에서 2.0 사이에서 여러번 반복하여 영상을 재구성하였다. 감산에 의한 역동영상은 조영제 도달 전의 영상으로부터 조영제 유입 후의 영상을 차례로 빼어서 영상을 재구성하였으며, 이들 영상을 재정리하여 각 단면의 시간 경과에 따른 관류 양상을 연속하여 관찰하였다 두 방법에 의한 영상 재구성은 각각 약 10분 정도가 소요되었다.

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

  • Son, Soon-Yong;Kim, Yoon-Shin;Choi, Kwan-Woo;Seo, Sung-Mi;Min, Jung-Whan;Yoo, Beong-Gyu;Lee, Jong-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.2
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    • pp.786-792
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    • 2013
  • In this study was explored minimize side effects due to the additional injection of contrast medium and maintaining a high resolution imaging applied to the inspection and analysis of the contrast medium that affect the peak time biomechanics factors. Included 48 patients using the test bolus method, after measuring a patient's biomechanics factors of inspection before and during the test, correlation between contrast medium peak time and learn, matches the regression equation calculated and measured contrast medium peak time was assessed by the Bland Altman plot. Research result, inspections of SBP, HR contrast medium peak time and a significant negative correlation was, step 1, every increase, the contrast medium peak time significantly to -0.018 and -0.159 decreased, a fairly high concordance no difference between the two method. In conclusion, the regression equation using the existing methods, while maintaining excellent image quality that contrast medium is reduced to a patient, it can conclude that the alternative to the existing methods.

SNR and ADC Value Change before and after the injection of contrast medium during DWI test on metastatic spinal cancer patients (전이성 척추암 환자의 확산강조영상 검사 시 조영제 주입 전.후 ADC값의 변화에 대한 고찰)

  • Kim, Eng-Chan;Kim, Ki-Hong;Park, Cheol-Soo;Lee, Sun-Yeob;Yoo, Heung-Joon;Cho, Jae-Hwan;Jang, Hyun-Cheol;Kim, Bo-Hui;Han, Man-Seok
    • Journal of the Korean Society of Radiology
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    • v.5 no.1
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    • pp.37-49
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    • 2011
  • To examine the possible changes in the SNRs, CNRs, and ADC values for lumbar spines with metastasis based on the DW images before and after contrast agent injection taken from metastatic spinal cancer patients using a 1.5 T MR machine. The quantitative analysis revealed that in case of spinal cancer subjects, both SNRs and CNRs at all of those assessed locations significantly increased on the DWI after contrast agent injection compared to before, while on the ADC map images, SNRs significantly decreased. On the other hand, significantly decreased ADC values at all the assessed locations were found on the ADC map images. With reference to the normal group, significantly increased SNRs were found at all of the assessed locations on the DWI image after injection compared to before, while significantly decreased SNRs were found on the ADC map images. Also, significantly decreased ADC values at all the assessed locations were found on the ADC map images. For the qualitative analysis, after contrast agent injection, significantly increased signal intensities were found at the locations with spinal cancer on the DWI. In contrast, significantly decreased signal intensities were found on the ADC map images. The implication from the results showing that SNR and CNR significantly increased while ADC value significantly decreased at, above, and below the location of metastatic spinal cancer on DWI after contrast agent injection is that DWI obtained after contrast agent injection can be made available for wider application to vertebral disorders.