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Chapter 15 Edelman
Displays and Image Processing
| Question | Answer |
|---|---|
| Real world numbers are called what? | Analog numbers |
| True or false: analog numbers can have an unlimited and continuous range of values. | True |
| Discrete values are known as what? | Digital numbers |
| True or false: digital numbers are associated with computer devices and are limited to whole numbers. | True |
| Analog scan converter | Was the first type of scan converter. It had a funnel shaped vacuum tube with an electron gun. |
| Digital scan converter advantages: | Uniformity, stability, durability, speed and accuracy |
| The smallest building block of an image is called what? | A pixel, coming from the term picture element |
| True or false: an entire pixel is a single shade of gray | True |
| A bit comes from the term "binary digit" and is the ____________ amount of computer memory. | smallest |
| A to D converter | Takes energy coming back to the transducer and turns it back into pixels and bits |
| Editing an image before you hit the freeze button is called what? | Pre-processing |
| Once you hit freeze and the image is stored in the US's computer it is called what? | Postprocessing |
| True or false: D to A conversion no longer has to take place. | True, because we now have digital displays |
| True or false: Preprocessing cannot be reversed or undone | True |
| True or false: Post processing can be reversed or undone | True |
| True or false: Read magnification does not improve the image quality. | True |
| Read magnification is a _______ ____________ function. | Post processing |
| Write magnification is a _____ ___________ function. | Pre processing |
| Code excitation is a ______ ____________ function. | Pre processing |
| Coded excitation provides what advantages? | More focal zones, reduced speckle, allows for color and 2-D moving at the same time, higer SNR, improved axial res, improved spatial res, improved contrast res and deeper penetration |
| What imaging technique uses sonographic information from several different imaging angles to produce a single image? | Spatial compounding |
| An advanced technique that reduces speckle artifact and noise in an US image is called what? | Frequency compounding |
| Edge enhancement | |
| This technique superimposes a number of previous frames onto the most current frame. | Temporal compounding, persistance or temporal averaging |
| This method fills in the gaps between scan lines by predicting the missing information | Fill in interpolation |
| Elastography | |
| PACS (our pretzle) | |
| DICOM stands for what? | Digital imaging and computers in medicine |
| What is DICOMS usefulness? | It allows our images to be transferred to PACS |
| This part of the US machine takes in information from the transducer, stores it and later displays it. | Scan converter |
| Storage of an image in the scan converter is called what? | Writing |
| Later, information will be ________ from the scan converter for display on the monitor. | Read |
| Are bistable (black and white) images high contrast or low contrast? | High |
| The limitations of analog scan converters are: | Image fade, image flicker, instability, and deterioration. |
| What type of numbers are based on only zeros or ones? | Binary numbers |
| A group of 8 bits of computer memory such as 10011111 is called a what? | Byte |
| Two bytes of computer memory, or 16 bits, is called a what? | Word |
| Images with many shades of gray have a better what resolution? | Contrast |
Created by:
gillybruursema
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