Quality control

What is quality control used for?

maintain standards and to ensure reproducibitliy

What is NEMA standards?

national electrical manufacturers association

What standards must equipment meet prior to leaving the factory and upon installation?

NEMA standards

What is CFOV?

central field of view

What is UFOV?

useful field of view

What is exintrinsic?

collimator on

What is instrinsic?

collimator off

What is LEGAP?

low energy general all purpose

What is LEHR?

low energy high resolution

What is LEUHR?

low enegry ultra high resolution

What is MEGAP?

medium energy general all purpose

What is MELP?

medium energy low penetration

What is HE?

high energy

What is SPECT/TOMO/ECT?

Sinlge photon emission computed tomography

What is IRC?

image registration correction

What is MHR?

multi head registration

What is COR?

center of rotation

What is res checks?

checks resolution

What is PMT?

photomultiplier tube

What is PET?

positron emission tomography

What is CT?

computarized tomorpgrahy

What is UFOV used for?

dimensions of the gamam camera's intrinsic system

What is CFOV used for?

75% of UFOV where most iamging is done

What is filed uniformity?

ability of gamma camera to produce uniform image intrinsic or extrinsic uses flood

What are some sources of nonuniformity?

1. cracked crystal

2. correction table error

3. Co56/58 contamination

4. defective PMT tube

What is spatial resolution?

ability to separate small objects in space

What are some factors effecting spatial resoution?

1. off or poor uniformity

2. PHA window width

3. source to detector distance

4. gamma ray energy

What is sensitivity?

ability to detect ionizing events in a sodium iodide crystal

What 3 things can sensitivity be affected by?

1. incorrect energy

2. incorrect collimator

3. improper detector to source distance

What does sensitivtiy depend on?

collimator geometric efficieny

thickness of crystal

energy of ray and window

What is dead time?

time to separate two separate events

What is energy resolution?

ability to distinguish different gamma energies but limited by light generated by each PMT

What is spatial linearity?

Camera's ability to reproduce a straight line

What is differential uniformity?

track a moving 5 pixel train through the CFOV and UFOV finding the hottest and coldest pixels

What is integral uniformity?

hottest and coldest pixels over whole flood

What is calibration?

correction applied to patient data to account for camera imperfections

What is analysis/verification?

to check calibration data of the camera system

What is intrinsic energy calibration/ intrinsisc verification with tune?

adjusts each PMT so that each of the tubes measures signals equally

What is a system check?

daily test to ensure safe operation on system

What is a rez check?

check ability of camera system to resolve lesions

What is a monthly flood calibration?

Calibration used to correct for small non-uniformitis such as collimator errors

What is COR/IRC/MHR?

corrects for slight variations in position of the camera head

What are wipe tests and room surveys?

done to detect any contamination

What is computer/camera shutdown and reboot?

daily to reset computer connection to camera

What should the integrated uniformity values be for the daily flood?

5% and 6%

What should the differential uniformity values be for the daily flood?

3.5% and 4%

What should the unifromity be of the CZT/CT?

less than or equal to 6.5%

What should the integrated uniformity be of weekly instrinisc study?

5% and 6%

What should the differntial uniformity be of weekly instrinisc study?

2.5% and 3%

What is the dose for the monthly instrinsic calibration?

35 uCi

What should the integrated uniformity be of monthly instrinisc study?

5% and 6%

What should the differential uniformity be of monthly instrinisc study?

2.5% and 3%

What is the MHR for?

to align the detector to the gantry's COR to one another

What is the annual QC for siemens symbia?

MHR calibrations are done for each collimator in each configuration used clinically

What is mechanical PM?

mechanical maintenance was done to camera system so no need for calibration

What is electrical PM?

electrical components have been changed therefore the calibrations are no longer valid

What is timing window in PET daily QC?

how long does it take for a coincidnece to occur

What is singles in PET daily QC?

how long it takes for a single to occur

What is energy?

make sure it's the correct energy

What is the weekly pet qc?

singles

What is the quarterly Pet qc?

calibrations normalization, well counter correct, DQA baseline

What is PET normalization?

12 hours to perform

What is the PET 3D well counter correction?

water filled phantom and .81 mCi of F-18

List all daily quality control

What is this?

List all weekly quality control

What is this?

List all monthly quality control

What is this?

List all quarterly monthly quality control

What is this?

What is the annual quality control?

MHR calibrations