To help you get acquainted with our business, we have collected here some acronyms and phrases that are part of our everyday work.
Tomography and X-ray imaging
http://en.wikipedia.org/wiki/Tomography
| CT | Computed Tomography http://en.wikipedia.org/wiki/X-ray_computed_tomography |
| NDT | Non Destructive Testing http://en.wikipedia.org/wiki/Nondestructive_testing |
| MRI | Magnetic Resonance Imaging http://en.wikipedia.org/wiki/Mri, not in our focus. |
| SI | Statistical Inversion. Bayesian approach to inverse problems, where all model variables are handled as random variables. http://www.springer.com/mathematics/computational+science+%26+engineerin... |
| FBP | Filtered Back Projection, a technique that is used in FDK algorithm. http://en.wikipedia.org/wiki/Filtered_back_projection#Dual_transform |
| FDK | The algorithm of Feldkamp, David, Kress (1984) is a basic and traditional back-projection algorithm for three-dimensional image reconstruction from cone-beam projections. |
| ART, SART, MART | (Multiplicative / Simultaneous) algebraic Reconstruction Technique. These are iterative tomographic reconstruction algorithms. http://en.wikipedia.org/wiki/Algebraic_Reconstruction_Technique |
| OSEM | Ordered-Subsets Expectation Maximization, iterative method used in computer tomography. http://en.wikipedia.org/wiki/Osem_(mathematics) |
| MCMC | Markov Chain Monte Carlo method, used in statistical inversion theory. http://en.wikipedia.org/wiki/Markov_chain_Monte_Carlo |
| PSIG | Parallel Statistical Inversion alGorithm. Advanced reconstruction method by Eigenor. |
| CR |
Computed Radiography. Refers to X-ray radiography that uses an imaging plate instead |
| DR | Digital Radiography. X-ray projections are acquired directly with a digital sensor. Basic feature in CT imaging devices. Also sometimes referred to Direct Radiography. |
| FPD | Flat Panel Detector. |
| PACS | Picture Archiving and Communication System, an image storage and communication system mostly for medical images. |
| FoV | Field of view |
| Voxel | Volume element. Three-dimensional cube of data. |
| IP | Imaging Plate |
| CAT | Computerized axial tomography scan |
Radar
http://en.wikipedia.org/wiki/Radar
http://www.radartutorial.eu/index.en.html
| PRT, PRF, PRI | Pulse Repetition Time, Pulse Repetition Frequency, Pulse Repetition Interval. These all describe how often a pulse in sent from radar in different metrics. http://en.wikipedia.org/wiki/Pulse_repetition_frequency |
| SMPRF | Simultaneous Multi Pulse Repetition Frequency, also a trademark of Eigenor. http://journals.ametsoc.org/doi/abs/10.1175/JAM2288.1 |
| Single-PRI, Multi-PRI (/PRT/PRF) | There are a few differences if we speak about multi-PRT or multi-PRF pulsing schemes. Mainly, time intervals (example: T¹, T² and T³) between pulses are differently sequenced: Multi-PRF: T1, T1, T1, T1, T2, T2, T2, T2, T3, T3, T3, T3 and repeat Multi-PRT: T1, T2, T3, T1, T2, T3, T1, T2, T3, T1, T2, T3 and repeat This will make a difference in signal handling and enables or disables some features depending on the scheme. Generally speaking, Multi-PRT scheme can be considered more advantageous. |
| DSP | Digital Signal Processing (http://en.wikipedia.org/wiki/Digital_signal_processing). When we speak about it in radar contexts, we usually mean analog to digital conversions and filtering that is done on hardware. |
| I/Q data | Radar data that is represented as complex values in digital format. Input for our radar software. |
| GC | Ground Clutter, powerful echo that earth and other nearby targets (e.g. houses) produce that usually ruins radar data from close ranges. http://en.wikipedia.org/wiki/Ground_clutter#Clutter |
| ACF | Auto Correlation Function, http://en.wikipedia.org/wiki/Autocorrelation_function |
| SNR | Signal to Noise Ratio, describes the relationship between noisy data and real data in radar measurement. http://en.wikipedia.org/wiki/Signal-to-noise_ratio |
| Doppler speed (of an object) | Speed vector (of an object) that is perpendicular to the radar. http://en.wikipedia.org/wiki/Doppler_effect |
| Dual Polarization | Modern radars can send their pulses in two of polarizations. Typical radar pulse is a mixture of H(orizontal) and V(ertical) channels. The receiving is done on both channels as well. Many of the radar echoes have a different kind of echo in the other channel. |
| H | Horizontal polarization or channel. http://en.wikipedia.org/wiki/Weather_radar#Polarization |
| V | Vertical polarization or channel. http://en.wikipedia.org/wiki/Weather_radar#Polarization |
| dBZ | Unit of reflectivity. |
| X, C, Ka, Ku, W (band) | Radar bands of different wavelengths are used in radars, since they can detect different phenomena. Some bands are technically also very hard to implement in sending and receiving sense. http://en.wikipedia.org/wiki/Radar#Frequency_bands |
Computer Science
| GPU | Graphical Processing Unit i.e. graphics card of the computer, a very powerful tool for parallel calculations. http://en.wikipedia.org/wiki/Graphics_processing_unit |
| CPU | Central Processing Unit, i.e. central calculation unit of the computer. http://en.wikipedia.org/wiki/Cpu |
| AVX | Advanced Vector Extensions, new features, instructions and coding schemes in x86 architecture in microprocessors from Intel and AMD http://en.wikipedia.org/wiki/Advanced_Vector_Extensions |
| OpenCL | One of the possible methods to utilize GPUs as multipurpose calculation units, implemented in Eigenors products. http://en.wikipedia.org/wiki/OpenCL |