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Table 1 Characteristics of imaging techniques[20]

From: Emerging role of radiolabeled nanoparticles as an effective diagnostic technique

Imaging modality Spatial resolution Depth of penetration Sensitivity (mol/L) Molecular probe
PET 1 to 2 mm No limit 10−11 to 10−12 ng
SPECT 0.3 to 1 mm No limit 10−10 to 10−11 ng
FMT (optical) 1 to 3 mm <5 cm 10−6 to 10−12 μg
MRI 50 to 250 μm No limit 10−3 to 10−5 μg to mg
X-Ray, CT 25 to 150 μm No limit - mg
Ultrasound 30 to 500 μm mm to cm 10−6 to 10−9 μg to mg
  1. PET, positron emission tomography; SPECT, single-photon emission computed tomography; FMT, fluorescence molecular tomography; MRI, magnetic resonance imaging; CT, computed tomography.