Diffusion-weighted imaging (DWI) helps assess tissue cellularity and micro-structure by identifying changes in tissue water diffusion, eg, central nervous system (CNS) lymphoma.
apparent diffusion coefficient (ADC).[5] Lower ADC values correspond to well-organized tissue and high cellularity; higher ADC values correspond to low cellularity and not well-organized tissue. Thus high-grade or very cellular tumors (eg, lymphoma, Figure 4) may show lower ADC values. Similarly, increasing ADC values after treatment might indicate treatment response because tumor cell density decreases with cell death and leads to increase in the extravascular extracellular space (EES).
Positron emission tomography (PET) is a nuclear medical imaging technique that produces a three-dimensional image or picture of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Three-dimensional images of tracer concentration within the body are then constructed by computer analysis. In modern scanners, three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine.
apparent diffusion coefficient (ADC).[5] Lower ADC values correspond to well-organized tissue and high cellularity; higher ADC values correspond to low cellularity and not well-organized tissue. Thus high-grade or very cellular tumors (eg, lymphoma, Figure 4) may show lower ADC values. Similarly, increasing ADC values after treatment might indicate treatment response because tumor cell density decreases with cell death and leads to increase in the extravascular extracellular space (EES).
Positron emission tomography (PET) is a nuclear medical imaging technique that produces a three-dimensional image or picture of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Three-dimensional images of tracer concentration within the body are then constructed by computer analysis. In modern scanners, three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine.
No comments:
Post a Comment