This research is aimed at developing an optical sensor for remotely measuring human skin temperature in electromagnetically hostile environments, such as within a magnetic resonance imaging (MRI) scanner. In this feasibility study, various concentrations of europium doped lanthanum oxysulphide (La 2 O 2 S: Eu-0.1-15 mol % (m/o)) and terbium doped lanthanum oxysulphide (La 2 O 2 S: Tb -0.005-50 m/o) have been investigated in terms of crystallinity, photoluminescent (PL) spectral and decay time characteristics.For both phosphors, X-ray diffraction (XRD) has shown that as dopancy increases, the (100) and (002) -2 -P o s t -P r i n t
This study is focused on the development of a remote temperature sensing technology, i.e. optical laser-based sensor, using thermographic phosphors for medical applications particularly within an electromagnetically hostile MRI (magnetic resonance imaging) environment. A MRI scanner uses a strong magnetic field and radio waves to generate images of the inside of the body. The quality of the image improves with increasing magnetic resonance, however, the drawback of applying a greater magnetic strength is the inducement of heat into the body tissue. Therefore, monitoring the patient's temperature inside MRI is vital but until now, a practical solution for temperature measurement did not exist.This paper shows Europium doped Lanthanum Oxysulphide and 4m o C -1 at 512nm and 538nm, respectively. In addition, La 2 O 2 S: Tb has a lower quenching rate of 4.19m o C -1 at 548nm due to its faster decay time.
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