Related by context. Frequent words. (Click for all words.) 65 radioactive tracer 62 radiotracer 61 computed tomography CT scans 59 X ray fluorescence 59 magnetic resonance spectroscopy 59 fluorescent dyes 59 Positron Emission Tomography PET 59 fluorescent dye 58 spectrometry 58 ultrasonic waves 58 PET scans 58 positron emission tomography PET 58 gold nanorods 58 biological molecules 58 PET scanners 57 near infrared spectroscopy 57 X ray beams 57 scanning electron microscope 57 fluorescent proteins 57 x ray crystallography 57 confocal microscopy 56 mass spectroscopy 56 fluorophores 56 Doppler ultrasound 56 CT computed tomography 56 electron beams 55 X rays CT scans 55 PET scan 55 Raman spectroscopy 55 positron emission tomography 55 optical microscopes 55 optical coherence tomography 55 magnetic nanoparticles 55 synchrotron radiation 55 scintigraphy 55 radioisotopes 55 infrared spectroscopy 54 microbubbles 54 laser pulses 54 imaging scans 54 x ray imaging 54 imaging MRI 54 tomography 54 radioactive isotopes 54 NMR spectroscopy 54 fluorescing 54 fluorescence microscopy 54 Ultraviolet light 53 Quantum dots 53 PET scanning 53 computerized tomography 53 transmission electron microscopy 53 X ray beam 53 ultraviolet UV light 53 neutron scattering 53 gel electrophoresis 53 microelectrodes 53 laser ablation 53 ultraviolet light 53 iron oxide nanoparticles 53 nano particles 53 abnormal growths 53 needle biopsies 53 Virtual colonoscopy 53 magnetic resonance NMR 53 Fluorescence 53 PET imaging 53 magnetic resonance 52 DNA microarrays 52 dye molecules 52 fluoresce 52 microfluidic devices 52 chromophores 52 transmission electron microscope 52 fluorescence imaging 52 fine needle aspiration 52 EEGs 52 photosensitive 52 pulsed laser 52 thyroid glands 52 fluorescence 52 nanosized 52 optical biosensors 52 frequency comb 52 Magnetic resonance imaging 52 nanodiamonds 52 naturally occurring compounds 52 situ hybridization 52 quantum dots 52 radiopharmaceuticals 52 nanoparticles 52 electron microscope 51 nanoshells 51 microscopes 51 photodynamic therapy 51 photometer 51 nanospheres 51 radioisotope 51 optical microscopy 51 nano particle 51 ultrasound