LRA 215: Land Analysis and Resource Management Exam
which is NOT another name for undifferentiated cells? - answers✔✔mature cells
Which of the following is the most versatile type of x-ray beam limitation device? -
answers✔✔collimator
Which of the following is not a type of beam limitation device? - answers✔✔filter
Which of the following produce the greatest radiation exposure in diagnostic radiology? -
answers✔✔fluoroscopic procedures
Causes of repeat radiographs include the following: - answers✔✔1.dirty screens
2. incorrectly loaded cassettes
3. light leaks
4. chemical fog
5. processor artifacts
all of the above
One way to ensure against irradiating a women in the early stages of pregnancy is to institute
_____ for nonemergency procedures. - answers✔✔elective shielding
,Which of the following are placed between the patient and the image receptor (IR) to
preferentially absorb scatter radiation? - answers✔✔radiographic grids
An effective way of reducing patient dose is through - answers✔✔accurate and effective
positioning
Using CR, it is estimated that overexposures of up to _____, and underexposures up to _____
are recoverable, thus eliminating the need for retakes. - answers✔✔500%, 80%
Half-value layer (HVL) is defined as the thickness of a designated absorber required to -
answers✔✔decrease the intensity of the primary beam by 50% of its initial value
The number of repeat radiographs can be reduced by - answers✔✔eliminating voluntary patient
motion using immobilization devices
Which of the following exposure techniques will provide the least amount of radiation exposure
to the patient? - answers✔✔50 mAs, 90 kVp
high kVp and low mAs
How much total filtration is required when using over 70 kVp? - answers✔✔2.5mm Al
The greatest beam limitation is accomplished when the cone/cylinder is _____, and the
diameter opening is _____. - answers✔✔longer,smaller
To within what percent of the SID must the collimator light and actual irradiated area be
accurate? - answers✔✔2%
, Which of the following combinations would reduce patient radiation dose during an x-ray exam?
- answers✔✔higher kVp, lower mAs, increased filtration
Which of the following is the best type of gonadal shield to use during a sterile field procedure?
- answers✔✔shadow
The function of a filter is to remove which of the following from the x-ray beam? -
answers✔✔long wavelength radiation
As LET increases, RBE ____ - answers✔✔with an increase in LET; RBE also increases
Which of the following do not affect cell response to radiation? - answers✔✔Oxygen Initial
Distributors (OID)
As LET increases, RBE ____ - answers✔✔increases
Radiation sickness, known as _____, is a serious illness that occurs when the entire body
receives a high dose of radiation, usually over a short period of time. - answers✔✔acute
radiation syndrome
In order for the total body radiation syndrome to be applicable, radiation exposure must
happen under the following condition: - answers✔✔1. an organ must have been exposed
acutely,ie.., in a matter of seconds
2. there must be exposure of the total body area
3. external penetrating sources, e.g., x-rays, produce the radiation syndromes
The acute radiation syndrome includes the following: - answers✔✔bone marrow syndrome
gastrointestinal syndrome
which is NOT another name for undifferentiated cells? - answers✔✔mature cells
Which of the following is the most versatile type of x-ray beam limitation device? -
answers✔✔collimator
Which of the following is not a type of beam limitation device? - answers✔✔filter
Which of the following produce the greatest radiation exposure in diagnostic radiology? -
answers✔✔fluoroscopic procedures
Causes of repeat radiographs include the following: - answers✔✔1.dirty screens
2. incorrectly loaded cassettes
3. light leaks
4. chemical fog
5. processor artifacts
all of the above
One way to ensure against irradiating a women in the early stages of pregnancy is to institute
_____ for nonemergency procedures. - answers✔✔elective shielding
,Which of the following are placed between the patient and the image receptor (IR) to
preferentially absorb scatter radiation? - answers✔✔radiographic grids
An effective way of reducing patient dose is through - answers✔✔accurate and effective
positioning
Using CR, it is estimated that overexposures of up to _____, and underexposures up to _____
are recoverable, thus eliminating the need for retakes. - answers✔✔500%, 80%
Half-value layer (HVL) is defined as the thickness of a designated absorber required to -
answers✔✔decrease the intensity of the primary beam by 50% of its initial value
The number of repeat radiographs can be reduced by - answers✔✔eliminating voluntary patient
motion using immobilization devices
Which of the following exposure techniques will provide the least amount of radiation exposure
to the patient? - answers✔✔50 mAs, 90 kVp
high kVp and low mAs
How much total filtration is required when using over 70 kVp? - answers✔✔2.5mm Al
The greatest beam limitation is accomplished when the cone/cylinder is _____, and the
diameter opening is _____. - answers✔✔longer,smaller
To within what percent of the SID must the collimator light and actual irradiated area be
accurate? - answers✔✔2%
, Which of the following combinations would reduce patient radiation dose during an x-ray exam?
- answers✔✔higher kVp, lower mAs, increased filtration
Which of the following is the best type of gonadal shield to use during a sterile field procedure?
- answers✔✔shadow
The function of a filter is to remove which of the following from the x-ray beam? -
answers✔✔long wavelength radiation
As LET increases, RBE ____ - answers✔✔with an increase in LET; RBE also increases
Which of the following do not affect cell response to radiation? - answers✔✔Oxygen Initial
Distributors (OID)
As LET increases, RBE ____ - answers✔✔increases
Radiation sickness, known as _____, is a serious illness that occurs when the entire body
receives a high dose of radiation, usually over a short period of time. - answers✔✔acute
radiation syndrome
In order for the total body radiation syndrome to be applicable, radiation exposure must
happen under the following condition: - answers✔✔1. an organ must have been exposed
acutely,ie.., in a matter of seconds
2. there must be exposure of the total body area
3. external penetrating sources, e.g., x-rays, produce the radiation syndromes
The acute radiation syndrome includes the following: - answers✔✔bone marrow syndrome
gastrointestinal syndrome
