WORKBOOK
,
, 1 Preliminary Steps in Radiography
REVIEW
New and different important factors must be considered 4. From the following list, circle the factors that mAs
every time a radiograph is obtained. This exercise pro- affect in digital imaging.
vides a comprehensive review of those important areas. a. OD
Items require you to fill in missing words, select answers b. Contrast
from a list, provide a short answer, or choose true or false c. Image noise
(provide an explanation for any statement you believe to d. Spatial resolution
be false). e. Patient dose
1. Define image receptor (IR). 5. Fig. 1-1 shows two images with different radio-
graphic optical density. Compare these images and
identify each according to its density. (The choices
are insufficient density and proper density.)
a. Image A:
2. List the four types of IRs used in diagnostic radiology.
b. Image B:
L L
3. Define the following radiographic terms:
a. Opticaldensity(OD):
b. Brightness:
c. Contrast: A B
Fig. 1-1 Two images showing different radiographic density.
d. Spatialresolution:
6. What exposure factor controls radiographic contrast?
b. Distortion:
7. Fig. 1-2 shows two images with different radio-
c. Magnification: graphic contrast. Compare the images and identify
each according to its contrast. (The choices are short
scale [high contrast] and long scale [low contrast].)
d. Contrast resolution: a. Image A:
b. Image B:
1
Copyright © 2016 by Elsevier. All rights reserved. Chapter 1 Preliminary Steps in Radiography
Copyright © 2012, 2007, 2003, 1999, 1996 by Mosby, an affiliate of Elsevier Inc. All rights reserved.
,
10. From the following list, circle the two factors that
control radiographic magnification.
a. Time, in second(s)
b. mA
c. kVp
d. Object-to-image-receptor distance (OID)
e. Source-to-image-receptor distance (SID)
11. True or false. All radiographs yield some degree of
magnification.
12. Fig. 1-4 shows two images with different degrees
of magnification. Assuming that both patients are
L L average-size adults, which image (A or B) shows the
A B most magnification?
Fig. 1-2 Two images showing different scales of radio- graphic
contrast.
8. From the following list, circle the six factors that
control spatial resolution.
a. IP phosphor (digital)
b. Flat panel detector
c. Motion
d. Distance
e. Exposure
f. Geometry
g. Focal spot size
h. mA
i. kVp
9. Fig. 1-3 shows two images with different levels of
spatial resolution. Compare the images and identify
each according to its spatial resolution. (The choices
are sharp image and unsharp image.)
A L B L
a. Image A:
Fig. 1-4 Two images showing different levels of magnifi
b. Image B:
L L
13. From the following list, circle the five factors that
control or affect shape distortion of a body part.
a. Alignment
b. Angulation
c. Central ray
d. IR
e. Anatomic part
f. OID
g. SID
A B
Fig. 1-3 Twoimages showing different levels of spatial resolution.
2
Chapter 1 Preliminary Steps in Radiography Copyright © 2016 by Elsevier. All rights reserved.
Copyright © 2012, 2007, 2003, 1999, 1996 by Mosby, an affiliate of Elsevier Inc. All rights reserved.
,
, 1 Preliminary Steps in Radiography
REVIEW
New and different important factors must be considered 4. From the following list, circle the factors that mAs
every time a radiograph is obtained. This exercise pro- affect in digital imaging.
vides a comprehensive review of those important areas. a. OD
Items require you to fill in missing words, select answers b. Contrast
from a list, provide a short answer, or choose true or false c. Image noise
(provide an explanation for any statement you believe to d. Spatial resolution
be false). e. Patient dose
1. Define image receptor (IR). 5. Fig. 1-1 shows two images with different radio-
graphic optical density. Compare these images and
identify each according to its density. (The choices
are insufficient density and proper density.)
a. Image A:
2. List the four types of IRs used in diagnostic radiology.
b. Image B:
L L
3. Define the following radiographic terms:
a. Opticaldensity(OD):
b. Brightness:
c. Contrast: A B
Fig. 1-1 Two images showing different radiographic density.
d. Spatialresolution:
6. What exposure factor controls radiographic contrast?
b. Distortion:
7. Fig. 1-2 shows two images with different radio-
c. Magnification: graphic contrast. Compare the images and identify
each according to its contrast. (The choices are short
scale [high contrast] and long scale [low contrast].)
d. Contrast resolution: a. Image A:
b. Image B:
1
Copyright © 2016 by Elsevier. All rights reserved. Chapter 1 Preliminary Steps in Radiography
Copyright © 2012, 2007, 2003, 1999, 1996 by Mosby, an affiliate of Elsevier Inc. All rights reserved.
,
10. From the following list, circle the two factors that
control radiographic magnification.
a. Time, in second(s)
b. mA
c. kVp
d. Object-to-image-receptor distance (OID)
e. Source-to-image-receptor distance (SID)
11. True or false. All radiographs yield some degree of
magnification.
12. Fig. 1-4 shows two images with different degrees
of magnification. Assuming that both patients are
L L average-size adults, which image (A or B) shows the
A B most magnification?
Fig. 1-2 Two images showing different scales of radio- graphic
contrast.
8. From the following list, circle the six factors that
control spatial resolution.
a. IP phosphor (digital)
b. Flat panel detector
c. Motion
d. Distance
e. Exposure
f. Geometry
g. Focal spot size
h. mA
i. kVp
9. Fig. 1-3 shows two images with different levels of
spatial resolution. Compare the images and identify
each according to its spatial resolution. (The choices
are sharp image and unsharp image.)
A L B L
a. Image A:
Fig. 1-4 Two images showing different levels of magnifi
b. Image B:
L L
13. From the following list, circle the five factors that
control or affect shape distortion of a body part.
a. Alignment
b. Angulation
c. Central ray
d. IR
e. Anatomic part
f. OID
g. SID
A B
Fig. 1-3 Twoimages showing different levels of spatial resolution.
2
Chapter 1 Preliminary Steps in Radiography Copyright © 2016 by Elsevier. All rights reserved.
Copyright © 2012, 2007, 2003, 1999, 1996 by Mosby, an affiliate of Elsevier Inc. All rights reserved.
