A Review of Gamma Camera Technology for Medical Imaging

High-Resolution 4D Preclinical Single-Photon Emission Computed Tomography/X-ray Computed Tomography Imaging of Technetium Transport within a Heterogeneous Porous Media

“…Vandehey et al 17 performed a detailed performance assessment of a clinical SPECT system to verify the resolution, uniformity, and linearity of the images obtained for nonstandard geologic imaging applications. Recently, Pini et al 18 utilized 3D positron emission tomography (PET) imaging, a method related to SPECT, to monitor 11 C transport and combined this information with high resolution CT images to model the transport behavior through a rock sample.…”

“…Hao et al, for example, performed a column experiment where a sodium iodide scintillation detector was used to monitor the accumulation of 22 Na ( t 1/2 = 2.60 yrs, γ-energy = 511 and 1275 keV) on grain surfaces of silica gel in response to increases in the pH of the influent solution to a column. Corkhill et al provide an example where a clinical gamma-camera was used to map the 2D distribution of 99m Tc (the metastable form of technetium-99; t 1/2 = 6.0 h, γ-energy =140 keV) to determine in situ parameters for transport. In contrast, Lear et al and Vandehey et al investigated microbially facilitated redox reactions by monitoring how a 99m Tc tracer partitions between the fluid and soils in microcosms.…”

Comparison of Low-Energy and Medium-Energy Collimators for Thyroid Scintigraphy with 123I

“…For thyroid imaging, 123 I is a more ideal radioisotope than 131 I because 123 I is comparable to 99m Tc, has less septal penetration with better image quality, and exposes the patient to less radiation (1,2). It has the most abundant g-rays, at 159 keV, which is comparable to the 140 keV from 99m Tc, and can be imaged with pinhole, low-energy, or medium-energy (ME) collimators (3). A pinhole collimator provides more details for imaging small organs such as the thyroid glands.…”