Research Article
A Comparison of Imaging Techniques to Monitor Tumor Growth and Cancer Progression in Living Animals
Table 3
Summary of imaging methods used for detection of tumors in living mice.
| Method | Physical basis | Reagents used | Spatial resolution | Reporter gene needed | Smallest detectable tumor (diameter) | Analysis time | Main advantages | Main disadvantages |
| T2W-MRI | Proton spin relaxation after radiowave emission | None | 100 μm | No | 1 mm | 3 hours/ mouse 30 hours/10 mice | High spatial resolution; Anatomical information; Gives tumor localization, size and morphology | Low throughput; Respiratory motion and high background make tumor detection in lungs challenging | FDG-PET | High-energy γ rays | 18Fluoro-deoxy-glucose | 2 mm | No | <1 mm | 3 hours/ mouse 13 hours/ 10 mice | Detection of nonpalpable tumors; Quantifies tumor cell metabolism; Gives tumor localization | High background in some organs (brain, and bladder) prevents tumor detection in these regions | Biolumines-cence imaging | Visible light emitted during chemical reaction | D-luciferin substrate | 1 to 10 mm dependant on tissue depth | Yes | <1 mm | 1 hour/ mouse 2 hours/10 mice | Detection of nonpalpable tumors; Low background; Relative measure of tumor size; High throughput | Light emission dependant on 1/ tissue depth, 2/local availability of substrate reagents (luciferin, O2, and ATP) | Fluorescence imaging | Visible light emitted after fluorochrome excitation | None | 1 to 10 mm dependant on tissue depth | Yes | 2 mm | 30 min/ mouse 1 hour/ 10 mice | High throughput | Light emission dependant on tissue depth; High background due to tissue autofluorescence |
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