問題一覧
1
in digital radiography involves use of flat panel detector or other digital sensors to capture images.
Image Consistency
2
________ also important to assess when performing exposure factors. _________ to contrast media should also be discussed thoroughly with the patient.
- Patient habitus - Allergies
3
When __ decreases, resolution is improved as well as when SID increases.
OID
4
Prime exposure factors are? KMES
- kVp - mA - Exposure Time - SID
5
are viewed on high quality monitors and can be manipulated post-process. PACS facilitates storage, retrieval, and distribution of images, while DICOM standards ensure seamless communication between systems. In contrast conventional film based radiography relies on chemical processing for image development.
Digital images
6
function of this in the image is to make anatomy more visible. It is necessary for the outline or border of a structure to be visible.
Image Contrast
7
its size and composition influemce radiographic technique.
Pathology
8
For every 4-5 cm change in thickness, change mAs by factor of what?
2
9
maintains exposure by changing mAs for different part size. Double or halve mAs for every 4-5 cm part size
Fixed kVp Theory
10
- device that measure the quantity of radiation that reaches the image receptor. - automatically terminates the exposure when the image receptor has received the required radiation intensity. - designed to compensate for changes in patient thickness. - system used to terminate length of exposure in order to control the amount of radiation reaching the IR.
Automatic Exposure Control (AEC)
11
- advantage of digital radiographic imaging over screen film is the ability to manipulate the image before and after display. - Preprocessing and post processing, they alter image appearance, usually for the purpose of improving image contrast.
Digital imaging processing
12
designed to compensate for changes in patient thickness. Patient consideration in factor formulation is crucial for ensuring optimal image quality while lowering radiation exposure.
AEC System
13
Digital radiography has significantly advanced medical imaging with techniques to ensure optimal image density. What techniques? HA
- Histogram analysis - Automatic Rescaling
14
5 Choice of Technique System MAAPI
- Manual technique system - AEC System - Anatomically programmed system - Patient thickness - Image processing
15
3 Factors to Consider in exposure standardization PCP
- Patient factors - Composition - Pathology
16
this level of kVp results in reduced imaged contrast.
High kVp
17
involves evaluation of the patient. Patients size, shape and physical condition greatly influenced the required radiographic technique.
Patient factors
18
maintains exposure by changing kVp for different part size. Changes by 2 kVp for every cm of part size (4-6 cm rule)
Variable kVp Theory
19
allows selection of a specific body part and position, resulting in display of preprogrammed exposure factors. These may include AEC information.
Anatomically programmed system
20
maintains exposure when kVp is changed
Variable and Fixed kVp Theory
21
built in sensors in most radiographic units. It automatically adjust exposure parameters such as MAs, based on the amount of radiation reaching the IR.
Automatic Exposure Control System
22
involves manipulating exposure parameters such as SID ,OID, kVp and mAs.
Receptor Exposure Standardization
23
purpose is not to minimize patient radiation dose but to rather minimize motion blur thatb can occur because of the patient motion.
Exposure Time
24
characteristics of radiographic image including OPTICAL DENSITY, IMAGE CONTRAST, IMAGE DETAIL AND DISTORTION.
Image Quality Factors
25
- directly proportional to the exposure time (mAs).
Patient thickness
26
Under this, the Radiographer must estimate the mass density of the anatomical part and the range of mass densities involved.
Composition
27
requires the radiographer to manually adjust exposure factors(kVp, mAs) based on factors such as the patient habitus, the anatomical part, and the type of examination.
Manual technique system
28
- affects exposure of the image receptor according to the inverse square law. - largely determines the intensity of the x ray beam at the image receptor.
SID
29
- primary control of x ray beam quality and therefore beam penetrability. - controls the scale of contrast on the finished radiograph.
kVp
30
4 Purpose of Exposure Factor Formulation IPRD
- Image Quality - Patient Safety - Reduce Retakes/Repetition - Dose Management
31
Type of Image Processing MAD
• Manual processing • Automatic processing • Digital processing
32
determines the number of x rays produced and therefore the radiation quantity and therefore the patient radiation dose.
mA