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Ch 29 bushong
Physics 29
| Question | Answer |
|---|---|
| What is the study of the response of the human eye to light? | photometric or photometry |
| Luminous intensity ________ with increasing distance from the source. | decreases |
| What is the best way to view a monitor? (cosine law) | straight on |
| What is the basic photometric unit? | lumen |
| What 3 things does an AMLCD have that is better than the cathode tube ray? | 1)better contrast 2) gray scale definition 3)less intrinsic noise |
| What is a big disadvantage with AMLCD? 2 things! | 1) loses contrast 2) luminous intensity from any angle |
| In the AMLCD, the liquid crystal ia a material state between ____________ and ___________. | liquid and a solid |
| What type of display panels are almost all medical digital display devices? | monochrome liquid display |
| AMLCD are designed to better reduce the influence of _________ ________ on image contrast. In your book! | ambient light |
| Spatial resolution improves with the use of a __________ __________ display device? | higher megapixel |
| What are medical flat panel digital display devices identified by? | pixel size |
| Approximately ______% of the backlight is transmitted through the monochrome monitor, and only ________ of that through a color monitor | 10 %, 1/2 |
| _______ _______ must be reduced to near darkness for best viewing. | ambient light |
| Preprocessing is _______, while postprocessing is __________. | automatic, manual |
| What is signal interpolation? | occurs when some of the pixels are defective and the surrounding pixels are averaged and the defective pixels are assigned that averaged number |
| ___________ and ____________ are automatic calibration images designed to make response to the image receptor uniform. Also known as ______________ | offset, gain images |
| The _______ the matrix size a digital display has, the better _______ __________ due to smaller pixels. | larger, spatial resolution |
| What does PACS stand for? | Picture Archiving Communication System |
| Name the 4 principal components of PACS. | 1)Image acquisition system 2) display sys 3) network sys 4) storage system |
| _____ ______ allows you to register the image to correct for patient motion. | pixel shift |
| Anything that can be done to a film to change its appearance occurs when? | post processing |
| What is the national standard for transmission in teleradiology? | DICOM |
| What are clients in PACS? | various types of devices allowing for storage, retrieval, viewing images, workstations, dept and hospital mainframe, and secreterial work stations |
| What is the RIS of PACS? | Radiology Information System |
| How do you determine the image size? | product of the matrix size and gray scale bit depth |
| How do you calculate the file size of an image? | matrix size X's grayscale |
| Matrix size is 1024X1024 and has a 2.0 byte gray scale. Calculate | 1024 X 1024 = 1048576, multiply answer by 2= 2,097,152 or 2.1 mega bytes |
| What is teleradiology? | the process of remote transmission and viewing of images |
| What are some of the things that the RIS function can do? | message, mail utilities, calendar reporting, storage of text dadta, financial accounting |
Created by:
radgirl37
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