24 research outputs found
Measurement of creatine kinase reaction rate in cerebrum using 31-phosphorus magnetization transfer approach in magnetic resonance spectroscopy
νμλ
Όλ¬Έ (μμ¬)-- μμΈλνκ΅ λνμ : νλκ³Όμ μΈμ§κ³Όνμ 곡, 2014. 8. μ΄λμ.μλ‘ : μλ°λ
Έμ μΌμΈμ°(ATP, adenosine triphosphate)μ ν©μ±κ³Ό λΆν΄λ μλͺ
체μ μλμ§ λμ¬ νλμ νμμ μΈ κ³Όμ μ΄λ€. νΉν, ν¬λ μν΄ν€λμ (CK, creatine kinase) λ°μμ μ μνκ² ATPλ₯Ό ν©μ±νμ¬ μμ μ μΌλ‘ μλμ§λμ¬κ° μ΄λ£¨μ΄μ§ μ μλλ‘ νλ€. μ΅κ·Ό λ°νλ μ°κ΅¬μμ λ λ΄ μλμ§λμ¬ μ νμ λ€μν μ κ²½, μ μ μ§νκ³Όμ μκ΄κ΄κ³κ° μλ €μ§λ©΄μ, μ¬λμμ μλμ§λμ¬ ν¨μμ νμ±λ μΈ‘μ μ λν μ°κ΅¬κ° κ΄μ¬μ λ°κ³ μλ€. κ·Έλ¬λ, μμ§ κ΅λ΄μμλ μΈ(31P, phosphorus) μν μ μ΄(MT, magnetization transfer) μ기곡λͺ
λΆκ΄μμ(MRS, magnetic resonance spectroscopy)μ μν νλ‘ν μ½μ΄ μ 립λμ΄μμ§ μλ€. ν΄μΈμμλ ν΅μ기곡λͺ
(NMR, nuclear magnetic resonance) system λλ Siemens Magnetic Resonance Imaging (MRI) systemμ μν μ€μ μ΄ κ°λ°λμ΄ μ°κ΅¬κ° μ§ν μ€μ΄μ§λ§, Philips MRI Systemμμλ μμ§ νμ€μ μΈ νλ‘ν μ½μ΄ μ€μ λμ΄μμ§ μμΌλ©°, μμ€ν
λ³λ‘ λ€λ₯Έ νΉμ±μ΄ μκΈ° λλ¬Έμ, ν μμ€ν
μμ μ€μ ν νλ‘ν μ½μ κ·Έλλ‘ λ€λ₯Έ μμ€ν
μμ μ¬μ©νλ κ²μ λΆκ°λ₯νλ€. λ°λΌμ, λ³Έ μ°κ΅¬μμλ Philips MRI systemμμ 31P MT MRSλ₯Ό μ΄μ©ν΄ μ μ μ±μΈμμ CKλ°μ μλ μμ kfλ₯Ό μΈ‘μ νλ νλ‘ν μ½μ κ°λ°νκ³ , μΈ‘μ μμ νλΉμ±μ νμΈνμ¬ λ λ΄ μλμ§λμ¬ ν¨μ¨μ±μ λΉμΉ¨μ΅μ μ΄κ³ μ§μ μ μΌλ‘ νκ°ν μ μλ λ°©λ²λ‘ μ ꡬμΆνκ³ μ νμλ€.
λ°©λ²: Philips Magnetic Resonance Imaging Systemμμ 31P volume head coilμ μ΄μ©νμ¬ MT MRSμμ μ μ μν(steady-state) ν¬ν λ°©λ²λ‘ μ ν΅ν΄ CK λ°μμλ kfλ₯Ό μΈ‘μ νμλ€. 건κ°ν μ±μΈ 19λͺ
μ λμμΌλ‘ νμκ³ , κ·Έ μ€ 6λͺ
μ μ°κ΅¬μ°Έμ¬μκ° μ ν¬ν(pre-saturation) νλΌλ―Έν° κ°μ μ€μ νκΈ° μν μ€νμ μ°Έμ¬νμλ€. 13λͺ
μ μ°κ΅¬μ°Έμ¬μλ₯Ό λμμΌλ‘, μ€μ λ νλ‘ν μ½μ ν΅ν΄ 31P MT MRSμ€ννΈλΌ(spectra)λ₯Ό νλνμκ³ , ν¬μ€ν¬ν¬λ μν΄(PCr, phosphocreatine)μ μμ ν볡(inversion recovery)λ°©λ²μΌλ‘ T1μ΄μμκ°(relaxation time)μ μΈ‘μ νμ¬ kfκ°μ κ³μ°νλ€.
κ²°κ³Ό: Ξ³-ATP (gamma-ATP)λ₯Ό ν¬νμν€κΈ° μν μ ν¬ν νλΌλ―Έν°λ, μμ μ£Όνμ(offset frequency)λ₯Ό -94(Hz), μ§λ κ°(pulse angle)μ 3000, μ νΈμ§μμκ°(window)μ 1(Hz), μ νΈ νκ· νμ(NSA, number of signal average)λ₯Ό 64μΌλ‘ μ€μ νμλ€. T1 μ΄μμμμ νλνκΈ° μν μκ° μ§μ μ κ° 55, 661, 1464, 2653, 5000(ms)μΌλ‘ λ€μ― κ°λ₯Ό μ€μ νμλ€. μ΅μ’
μ μΌλ‘ κ²°μ λ νλ‘ν μ½μ μ΄ μ΄¬μμκ°μ 37λΆ2μ΄μλ€.
λ³Έ μ°κ΅¬μμ κ°λ°ν νλ‘ν μ½μ ν΅ν΄ μΈ‘μ ν νκ· T1 μ΄μμκ°μ 0.48(νμ€νΈμ°¨ 0.05)(s-1)μ΄μμΌλ©°, νκ· kfκ°μ 0.28(νμ€νΈμ°¨ 0.07)μ΄μλ€. νκ· μμμ΄μ¨λλμ§μ(pH)λ 7.04(νμ€νΈμ°¨ 0.04), νκ· λ§κ·Έλ€μμ΄μ¨λλμ§μ(pMg)λ 4.46(νμ€νΈμ°¨ 0.27)μ΄μλ€. μ΄ κ°λ€μ μ νμ°κ΅¬μ κ²°κ³Όκ°κ³Ό μΌκ΄λ κ²°κ³Όλ‘ λ³Ό μ μλ€. λ°λΌμ κ°λ°λ νλ‘ν μ½μ΄ νλΉν¨μ μ
μ¦νμλ€.
κ³ μ°°: λ³Έ μ°κ΅¬μμ μ€μ ν νλ‘ν μ½μ μ΄μ©νμ¬ λΉκ΅μ 짧μ μκ° μμ νλΉν μΈ‘μ μ΄ κ°λ₯νλ€. λ³Έ μ°κ΅¬λ μ΅μ΄λ‘ Philips Magnetic Resonance Systemμμ 31P μ½μΌμ μ΄μ©νμ¬ λ λ΄ μλμ§λμ¬ μ°κ΅¬ λ°©λ²λ‘ μ ν립νμμμ κ·Έ μμκ° μλ€. λ³Έ μ°κ΅¬μ κ²°κ³Όλ ν₯ν μλμ§λμ¬μ κ΄λ ¨λ μ μ μ§νμ μμΈμ κ·λͺ
νκ³ μΉλ£ν¨κ³Όλ₯Ό νμΈνλ λ°μ μ΄μ© λ μ μμ κ²μ΄λ€.Introduction: The synthesis and decomposition of adenosine triphosphate (ATP) are essential processes for the energy metabolism of organisms. In particular, the creatine kinase (CK) reaction rapidly synthesizes ATP andenables stable energy metabolism. Recent studies have reported relationships between brain energy metabolism and neurodegenerative and psychiatric disorders, contributing to growing interest in the field. Thus, the current study aimed to validate a noninvasive and direct methodology to evaluate the efficiency of brain energy metabolism, by measuring the forward transition rate constant (kf) of the CK reaction through phosphorus (31P) magnetization transfer magnetic resonance spectroscopy (MT-MRS).
Method:Using the steady-state saturation MT-MRS method, the kfvalues from 19 participants were measured with a 31P volume head coil in a Philips magnetic resonance system. Among the participants, 6 participants participated in an experiment to set up the protocols for pre-saturation parameters. Subsequently, the 31P MT-MRS spectra were obtained from 13 participants by using the established protocols. The kf values were calculated from the T1 relaxation time measured by using the inversion recovery of phosphocreatine.
Results: The following parameters were set up in order to saturate the peak of Ξ³-ATP (gamma-ATP): offset frequency = -94 Hzpulse angle = 3000 degreewindow = 1 Hznumber of signal average (NSA) = 64. For the T1 relaxation protocols, 5 time points including 55, 661, 1464, 2653, and 5000 milliseconds were chosen. The total scanning time of the finally established protocol was 37 minutes and 2 seconds. The mean T1 relaxation time was 0.48(s-1) (standard deviation, SD=0.05). The mean kfwas measured as 0.28 (SD = 0.07) in the current study. The mean values of pH and pMg were 7.04 (SD=0.04) and 4.46 (SD=0.27), respectively. As these values are consistent with those from previous studies, the validity of the currently proposed novel protocol has been affirmed.
Discussion: Using the new protocols set up in the current study, to obtain a valid measure of kfin a relatively short period of time has become possible.
The present study is the first South Korean study which has validated a research methodology to study brain energy metabolites with a 31P volume coil in an magnetic resonance system. The current results may constructively contribute to the investigation ofthe cause of psychiatric disorders related to energy metabolism and the assessment of treatment effectiveness in the future.μλ‘ 1
μ°κ΅¬λ°©λ² 20
κ²°κ³Ό 34
κ³ μ°° 49
μ°Έκ³ λ¬Έν 59
μλ¬Έμ΄λ‘ 65Maste
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Όλ¬Έ (λ°μ¬)-- μμΈλνκ΅ λνμ : μλͺ
κ³ΌνλΆ, 2011.8. ν©λμ.Docto
士倧倫 θͺε³ η‘η©Ά
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Όλ¬Έ(μμ¬)--μμΈλνκ΅ λνμ :κ΅μ΄κ΅λ¬Ένκ³Ό κ΅λ¬Ένμ 곡,2003.Maste