The characterization of NMR signal for blood pressure monitoring system and its testing
Abstract: A blood monitoring
system based on NMR method has been designed on constructed. This set-up of
equipment used magnetic permanent, radio frequency (RF), receiver coil (RC),
function generator (FG), amplifier which included the filter, as well as the
oscilloscope digital storage. The background of this research was based on the
sensitivity of NMR signal. The signal must be separated from signals
background. This method was done by adjusting the frequency on FG, which was
connected to radio frequency (RF) coil, on empty sample. Subsequently, NMR
signal was received by RC, and that signal could be shown on oscilloscope at
resonance condition. The true frequency on NMR signal was Larmor frequency, and
the other was background. The two variables of this experiment were the
position of RF coil and the location temperature (20 up to 30oC). In
conclusion, the resonance frequency of NMR signal (as Larmor frequency) was 4.7
MHz (at static magnetic field of 1,600 gauss) and it could be separated from
background signals (3.4 and 6.2 MHz), and that signal was almost constant to
room temperature. The equipment was used for sample testing. It gave
systole/diastole data of 110/70 mmHg (on sphygmomanometer) that was similar to
17/9 mV (on NMR signal).
Author: Bambang Murdaka Eka
Jati, . Kusminarto, Agung Bambang Setio Utomo, Bambang Irawan
Journal Code: jpkedokterangg150356
