General Concepts 2 min read
SPECT (Single-Photon Emission Computed Tomography)
During the last three decades, there has been much excitement in the development of diagnostic radiology. The development is fueled…
THE ARCHIVES
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Defining Terms
Energy resolution: Full width at half maximum of graph of detected counts vs. energy, expressed as a percentage of the energy.…
General Concepts 3 min read
Place of Planar Imaging in Nuclear Medicine Today: Applications and Economics
There are various ways of thinking about diagnostic imaging and nuclear medicine. If the reason for imaging the patient is…
General Concepts 5 min read
Ancillary Electronic Equipment for Detection
The detectors used in nuclear medicine are attached to preamplifiers, amplifiers, and pulse shapers to form a signal that can…
General Concepts 5 min read
Various Detector Configurations
The detectors in clinical nuclear medicine are NaI(TI) crystals. In research applications, other substances are employed, but the engineering considerations…
General Concepts 3 min read
Detection of Photon Radiation
Gamma rays are detected when atoms in a detector are ionized and the ions are collected either directly as in…
General Concepts 5 min read
Nuclear Medicine
Nuclear medicine can be defined as the practice of making patients radioactive for diagnostic and therapeutic purposes. The radioactivity is…
General Concepts 1 min read
Problem and Artifacts in fMRI: The Brain–Vein Problem? The Brain-Inflow Problem?
The artifacts arising from large vessels pose serious problems to the interpretation of oxygenation sensitive fMRI data. It is generally…
General Concepts 5 min read
Mechanism
Flow-sensitive images show increased perfusion with stimulation, while blood oxygenation–sensitive images show changes consistent with an increase in venous blood…
General Concepts 2 min read
Advances in Functional Brain Mapping
The popularity of fMRI is based on many factors. It is safe and totally noninvasive. It can be acquired in…
General Concepts 2 min read
Digital Data Processing
A typical scan protocol calls for a sequence of tailored RF and gradient pulses with duration controlled in steps of…
General Concepts 3 min read
Radiofrequency Coils
Radiofrequency (RF) coils are components of every scanner and are used for two essential purposes — transmitting and receiving signals…