Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
권호 표지

Individual Variation of Radiation Adaptive Responses in Patients Undergoing Imaging Studies Using $^{99m}Tc$ Labeled Radiopharmaceuticals

$^{99m}Tc$ 표지 방사성의약품을 이용한 핵의학 영상검사를 받은 환자에서 방사선 적응반응의 개인간 차이에 대한 연구

  • Li, Ming-Hao (Department of Nuclear Medicine, Chonnam National University Medical School) ;
  • Bom, Hee-Seung (Department of Nuclear Medicine, Chonnam National University Medical School) ;
  • Kwon, An-Sung (Department of Nuclear Medicine, Chonnam National University Medical School) ;
  • Kim, Young-Ho (Department of Nuclear Medicine, Chonnam National University Medical School) ;
  • Kim, Ji-Yeul (Department of Nuclear Medicine, Chonnam National University Medical School)
  • 이명호 (전남대학교 의과대학 핵의학교실) ;
  • 범희승 (전남대학교 의과대학 핵의학교실) ;
  • 권안성 (전남대학교 의과대학 핵의학교실) ;
  • 김영호 (전남대학교 의과대학 핵의학교실) ;
  • 김지열 (전남대학교 의과대학 핵의학교실)
  • Published : 2003.06.30
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Abstract

It was reported that radiopharamaceuticals induced radiation adaptive response (RAR) in patients undergoing nuclear medicine imaging studies. Individual variations of RAR were not studied well. The purpose of this study was to evaluate individual variation of RAR in patients undergoing nuclear medicine imaging studies. Peripheral lymphocytes were collected from 23 patients undergoing $^{99m}Tc-diethylenetriamine$ pentaacetic acid $(^{99m}Tc-DTPA)$ renal scintigraphy, 18 patients undergoing $^{99m}Tc-methylene$ diphosphonate $(^{99m}Tc-MDP)$ bone scintigraphy and 21 patients undergoing $^{99m}Tc-tetrofosmin\;(^{99m}Tc-TF)$ scintigraphy were collected before and 4 hours after injection of radiopharmaceuticals. The lymphocytes were exposed to challenge dose of 2 Gy gamma rays using a cell irradiator. Numbers of ring-form (R) and dicentric (D) chromosomes were counted under the light microscope. and used to calculate the frequency of chromosomal aberration [Ydr=(D+R)/total number of counted lymphocytes]. Adaptation index (k) was defined 3s ratio of Ydr in conditioned lymphocytes over Ydr in unconditioned lymphocytes. Coefficients of variance of k in $^{99m}Tc-DTPA,\;^{99m}Tc-MDP\;and\;^{99m}Tc-TF$ were 35%, 34% and 21%, respectively k was not dependent upon age, sex, and underlying diseases. There was a wide variation of RAR induced by radiopharmaceuticals among patients undergoing nuclear medicine procedures. It remains to be determined for causes of such variation.

$^{99m}Tc$ 표지 방사성의약품을 이용한 핵의학 영상검사를 받은 환자들에서 방사선 적응반응이 개인간에 어느 정도 차이가 있는지 알아보고자 하였다. $^{99m}Tc-DTPA$ 신장 신티그라피를 시행한 환자 23명, $^{99m}Tc-MDP$ 골 신티그라피를 시행한 환자 18명 및 $^{99}mTc-TF$ 심근관류 신티그라피를 시행한 환자 21명, 총 62명의 환자를 대상으로 방사성의약품 주사 전, 그리고 주사후 4시간째 채혈하여 림프구를 채취 배양하였다. 고선량 방사선조사는 배양 46시간째 $^{137}Cs$ 조사기를 사용하여 2 Gy의 감마선을 조사하였다. 불안정 염색체의 발생빈도를 Ydr값으로 표현하였고, 방사선 적응반응 지수(k)는 저선량 전처치후 Ydr값을 전처치 전 Ydr값으로 나누어 k값이 1 미만일 때 방사선 적응반음이 유도되는 것으로 간주하였다. 대상환자 62명 중 61명에서 방사선 적응반응이 유도되었고 $^{99m}Tc-DTPA,\;^{99m}Tc-MDP$ 및 Tc-99m-TF 환자군에서 k값의 변동계수 (CV)는 각각 35%, 34%, 21%였다. k값은 성별, 나이 및 병명과 상관관계가 없었다. 핵의학검사를 시행한 환자들에서 방사성 의약품에 의해 유도된 방사선 적응반응은 다양한 개인차가 있었으며, 성별, 나이 또는 병명과 관계없는 다른 원인에 의한 것으로 판단되었다.

Keywords

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