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rad107 final review
| Question | Answer |
|---|---|
| Types of Mammography | -Screening mammography -Diagnostic mammography -Baseline mammogram |
| What is purpose of Fluoroscopy | Dynamic (real-time) imaging. |
| What is an accurate ACS guideline regarding routine mammography screening? | Annual screening starting at age 45, with the option to transition to biannual at age 55. |
| A diagnostic mammography unit must be capable of resolving microcalcifications that are smaller than: | 500 |
| Screening mammography | performed on asymptomatic females with the use of a two-view protocol, usually medial lateral oblique and cranial caudad, to detect an unsuspected cancer |
| Diagnostic mammography | is performed on patients with symptoms or elevated risk factors. Two or three views of each breast may be required |
| What component of the X-ray tube determines the geometric sharpness of the mammographic image? | Focal-spot size |
| Why is filtration added to the mammography X-ray beam? | To absorb low-energy X-rays that degrade image contrast without contributing to the image |
| Which device is placed between the breast and the image receptor to absorb scatter radiation and improve image contrast? | Grid |
| What system terminates the X-ray exposure automatically once the image receptor has received the correct radiation intensity? | Automatic exposure control (AEC) |
| In what year did the United States government mandate the regulations known as the Mammography Quality Standards Act (MQSA)? | 1992 |
| To prevent thermal overloading of the X-ray tube and limit excessive patient radiation dose during high-mA DF, what specific technique is used? | Pulse-progressive fluoroscopy |
| What is the sensitive component layer of a charge-coupled device (CCD) that generates an electrical charge when illuminated? | Crystalline silicon |
| In standard conventional fluoroscopy, the X-ray tube current is typically operated at what ranges? | Less than 5 mA |
| Which target-filter combination is commonly used in mammography to optimize soft-tissue contrast by generating a narrow, low-energy X-ray spectrum? | Molybdenum target with Molybdenum filtration |
| Each sweep of the source-detector around the body during CT is called a __________. | translation |
| The new development in the fourth-generation CT scanner is the ________________. | stationary detector assembly |
| The principal drawback of the first-generation CT scanner was the _______________. | long scanning time |
| What is the principal disadvantage of third-generation CT scanners? | Ring artifacts |
| The pixel size is reduced when the _______ size is increased and the _____________ size is fixed. | matrix; field of view |
Created by:
dani.vouga04