Quiz about Matemáticas y estadística

Question 1

What is the size of an 8cm object on a image with a 50cm field of view on a 512x512 matrix?

Accepted Answer

82 pixels

Answer

121 pixels

Answer

18 pixels

Answer

50 pixels

Question 2

Most random access memory (RAM) is what type of memory?

Accepted Answer

Volatile memory

Answer

Drum memory

Answer

EEPROM

Answer

Flash memory

Question 3

Convert 92 to binary.

Accepted Answer

01011100

Answer

01010110

Answer

01111101

Answer

11010000

Question 4

What type of memory can be read but not edited?

Accepted Answer

ROM

Answer

RAM

Answer

HD

Answer

SDA

Question 5

How many 512x512 images can be stored an a 1TB hard drive assuming 4096 shades per pixel?

Accepted Answer

2.5 million

Answer

2.6 billion

Answer

254 thousand

Answer

1.8 billion

Question 6

A PET/CT scan acquires a 250 slice CT using a 512x512 pixel image grid at 16 bit pixel resolution and a 120 slice PET image using a 128 x 128 pixel image grid at 16 bit resolution. What is the total storage requirement for the PET/CT scan?

Accepted Answer

135MB

Answer

311MB

Answer

1080MB

Answer

255MB

Question 7

What is 01110101 in decimal?

Accepted Answer

117

Answer

317

Answer

184

Answer

96

Question 8

A modern CT scanner is able to present 4096 color levels makes a 150 slice scan. How much memory is required to hold this scan?

Accepted Answer

59MB

Answer

75MB

Answer

150MB

Answer

0.5MB

Question 9

Random number generators randomly generate numbers.

Accepted Answer

False

Answer

True

Question 10

512 x 512 images are stored on a 700MB disk. Each pixel is 16 bits. How many images can the disk hold?

Accepted Answer

1,400 images

Answer

2,800 images

Answer

3,500 images

Answer

512 images

Question 11

How much storage is required for store an ASCII character?

Accepted Answer

8bits

Answer

1bit

Answer

1MB

Answer

16MB

Question 12

How many information states can 3 bytes hold?

Accepted Answer

54 states

Answer

256,010,960 states

Answer

16,777,216 states

Answer

8 states

Question 13

What operation is performed to double a binary number?

Accepted Answer

Shifting each bit to the left and adding a 0 on the right

Answer

Inverting each bit

Answer

Reversing the order of the bits

Answer

Inverting the left most bit

Question 14

What is the most fundamental unit of information in a computer?

Accepted Answer

bit

Answer

bool

Answer

int

Answer

byte

Question 15

What is the component of a computer which reconstructs a CT image?

Accepted Answer

CPU

Answer

CCD

Answer

RAM

Answer

I/O board

Question 16

A computer stores a 3D CT or MR image set as ___

Accepted Answer

A group of values corresponding to element intensity levels.

Answer

A GPU (graphics processing unit)

Answer

A vector file

Answer

An array of individual images with one image per Byte

Question 17

How many bits are in a megabyte?

Accepted Answer

8388608

Answer

640

Answer

1024

Answer

819204

Question 18

When reviewing a PET/CT image set, what type of memory is being used to allow you to quickly see each slice?

Accepted Answer

RAM

Answer

HDR

Answer

ROM

Answer

Virtual SSD

Question 19

What system is information storage on computers based on?

Accepted Answer

a binary system

Answer

a decimal system

Answer

a octal system

Answer

RAM

Question 20

What type of data is lost when you turn a computer off?

Accepted Answer

RAM

Answer

Hard Drive

Answer

Magnetic Tape

Answer

ROM

Question 21

Which computer component is responsible for executing a series of stored instructions?

Accepted Answer

CPU

Answer

SSD

Answer

RAM

Answer

Hard disk

Question 22

How many shades of gray can be held in 1 byte?

Accepted Answer

256 shades

Answer

4096 shades

Answer

56 shades

Answer

1024 shades

Question 23

How many bytes are in 34 bits of information?

Accepted Answer

5

Answer

6

Answer

3

Answer

4

Question 24

What is the ROC curve specificity of an imaging technique with the following performance statistics.
True positive = 20
False positive = 5
True negative = 4
False negative = 7

Accepted Answer

0.44

Answer

0.17

Answer

0.67

Answer

0.83

Question 25

For a Poisson distribution with a mean of 10, what is the probability of obtaining exactly 10 counts?

Accepted Answer

12.5%

Answer

66.7%

Answer

38%

Answer

3.3%

Question 26

A photon detector on an imaging system detects 202,500 photons in a measurement. What is the probability that the same imaging system will measure between 202,950 and 203,400 counts on the next measurement?

Accepted Answer

13.5%

Answer

8.3%

Answer

34.1%

Answer

68%

Question 27

What is the ROC curve sensitivity of an imaging technique with the following performance statistics.
True positive = 20
False positive = 15
True negative = 17
False negative = 1

Accepted Answer

0.95

Answer

0.44

Answer

0.67

Answer

0.83

Question 28

When will radioisotopes A and B have the same activity?

Radioisotope A - Initial Activity: 25mCi, Half-life: 1.2 hours

Radioisotope B - Initial Activity: 50mCi, Half-life: 1.1 hours

Accepted Answer

13 hours

Answer

Never (a time prior to the initial time)

Answer

15 hours

Answer

21 hours

Question 29

An implanted LDR source is prescribed to deliver 120Gy over the source life. How much dose has been delivered after 3 half lives?

Accepted Answer

105Gy

Answer

66Gy

Answer

15Gy

Answer

75Gy

Question 30

You are taking a professional exam and have no idea how to answer the final 10 questions. Each question has 4 possible choices. Based purely on chance, what is the probability of correctly guessing 8 of the questions?

Accepted Answer

0.04%

Answer

0.0015%

Answer

3.8%

Answer

0.71%

Question 31

A novel radiation source has a half life of 2 days. By about what percent does the source decay in 1 hour?

Accepted Answer

1.4%

Answer

2.1%

Answer

1%

Answer

5%

Question 32

A therapy has a 30% chance of success for any treatment. Given 5 treatments, what is the probability that at most 2 treatments are successful?

Accepted Answer

0.837

Answer

0.623

Answer

0.727

Answer

0.951

Question 33

You drive from point A to point B at a rate of 100mph. When you return to point A from point B you travel at 50mph. What is your average speed?

Accepted Answer

67 mph

Answer

59 mph

Answer

75 mph

Answer

The solution is dependent on the distance between points A and B

Question 34

Select all equations which calculate which yield 1% of the original activity.

Accepted Answer

4.6 / lambda

Accepted Answer

T(mean) x 4.6

Accepted Answer

T(1/2) x 6.6

Answer

T(1/2, eff) / 34.4

Question 35

Which statement is false regarding a Poisson distribution?

Accepted Answer

Poisson distributions may be approximated by a binomial distribution for small sample sizes.

Answer

Standard deviation as a percentage of the mean decreases as counts increase.

Answer

Poisson distributions are used to describe only random binary events.

Answer

Radioactive decay may be accurately modeled by a Poisson distribution

Question 36

What fraction of a sources original activity remains after it has decayed for 1 mean life?

Accepted Answer

37%

Answer

33%

Answer

50%

Answer

0%

Question 37

What is the meaning of a t-test with a p-value of 0.05?

Accepted Answer

There is a 5% chance the claim is false

Answer

There is a 5% chance the claim is true

Answer

There is a strong positive correlation

Answer

There is a strong negative correlation

Question 38

What is the diagonal length of a 20x20 cm² square?

Accepted Answer

28.3 cm

Answer

22.1 cm

Answer

24.7 cm

Answer

206.6 cm

Question 39

A chi-squared test is performed looking for a statistically significant difference between two experimental results. The test claims that a certain difference is present with a p value of 0.01. What does this mean?

Accepted Answer

There is a 99% chance that the claim is true.

Answer

The results of the test were inconclusive.

Answer

There is a 99% chance that the claim is false.

Answer

There is lower certainty of the result than a p value of 0.05 would indicate.

Question 40

It takes one OMP editor 2 hours to write a given number of questions and a second OMP editor 45 minutes to write the same number of questions. How long would it take both editors working together to write the same number of questions?

Accepted Answer

33 minutes

Answer

14 minutes

Answer

28 minutes

Answer

17 minutes

Question 41

How many days does it take to deliver 90% of the dose of Pd-103 (half life = 17 days) seed?

Accepted Answer

56.5 days

Answer

47.1 days

Answer

39.5 days

Answer

71.5 days

Question 42

The prefix pico indicates what power of 10?

Accepted Answer

-12

Answer

-6

Answer

9

Answer

-3

Answer

-9

Question 43

A radioactive sample is repeatedly counted yielding an average of 500 counts over one minute. 95% of 1 minute counting studies will fall within what range?

Accepted Answer

455 to 545

Answer

478 to 522

Answer

495 to 505

Answer

433 to 567

Question 44

An unknown isotope has an initial dose rate of 75cGy/hr and will deliver a total lifetime dose of 7,000cGy. What is the half life of the isotope?

Accepted Answer

2.7 days

Answer

32.0 days

Answer

59.4 days

Answer

16.7 days

Question 45

What is the equation for the average function value?

Accepted Answer

Question 46

What is the distance between points (0, 1, 2) and (3, 4, 5) on a 3-dimensional coordinate system?

Accepted Answer

5.2 cm

Answer

6.1 cm

Answer

3.0 cm

Answer

4.7 cm

Question 47

Sample A is measured producing 20,000 counts. Sample B is measured under identical conditions yielding 15,000 counts. Assuming standard uncertainty for each measurement, what is the total uncertainty of the ratio of sample A to sample B?

Accepted Answer

0.014

Answer

0.75

Answer

0.17

Answer

0.005

Question 48

A gamma camera detects an average of 100 counts per study. What is the standard deviation assuming a Poisson distribution of measurements?

Accepted Answer

10%

Answer

1%

Answer

2.718%

Answer

33.3%

Question 49

A radioactive sample is measured many times yielding a mean measurement of 10,000 events. Approximately what fraction of measurements yields a value between 9800 and 10200 events.

Accepted Answer

95.4%

Answer

34%

Answer

99.6%

Answer

68%

Question 50

What is the quadratic formula?

ax²+ bx + c = 0

Accepted Answer

x = [-b +/- sqrt(b² - 4ac)]/(2a)

Answer

x = [-b +/- sqrt(c² - 4ad)]/(2a)

Answer

x = [-b +/- sqrt(b² - 4ac)]/(2b)

Answer

x = [-b +/- sqrt(b² - 4ac)]/(2b)

Question 51

Mean life if given by:

Accepted Answer

1.44 x T_1/2

Answer

ln(T1/2)

Answer

3.1 x T_1/2

Answer

0.7 x T_1/2

Question 52

5 machines require 5 minutes to produce 5 shirts. How long will it take for 100 machines to produce 100 shirts?

Accepted Answer

5 minutes

Answer

55 minutes

Answer

100 minutes

Answer

50 minutes

Question 53

Dose fall off from an infinite line source is proportional to:

Accepted Answer

1/r

Answer

1/r3

Answer

r

Answer

r2

Answer

1/r2

Question 54

Approximately how many half lives are required to reduce activity by 99%?

Accepted Answer

6.6 half lives

Answer

50 half lives

Answer

7 half lives

Answer

5 half lives

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