Test 1 Flashcards
Continuous improvement of healthcare services through the systematic eveluation of processes
Quality improvement (QI)
A set of philosophies, methods, and tools for continuously quality improvement factors (ex: Lean and Six Sigma programs)
Continuous quality improvement (CQI)
Professional performance standards that define activities in the areas of education, interpersonal relationships, personal, and professional self-assessment, and ethical behavior
Total quality management (TQM)
3 things quality improvement (QI) does
Decrease costs, increase efficiency
Increase customer satisfaction
Ensure quality throughout the healthcare organization
4 problems quality improvement (QI) responds to
Increased competition
Escalating costs
Quality concerns
Demands for increased accountability = know who’s responsible (ex: computer logins)
W.E. Deming’s 14 points of management
Create constancy of purpose for improving products and services
Adopt the new philosophy
Cease dependence on inspection to achieve quality
End the practice of awarding business on price alone; instead, minimize total cost by working with a single supplier
Improve constantly and forever every process for planning, production and service
Institute training on the job
Adopt and institute leadership
Drive out fear
Break down barriers between staff areas
Eliminate slogans, exhortations and targets for the workforce
Eliminate numerical quotas for the workforce and numerical goals for management
Remove barriers that rob people of pride of workmanship, and eliminate the annual rating or merit system
Institute a vigorous program of education and self-improvement for everyone
Put everybody in the company to work accomplishing the transformation
An independent, not-for-profit organization dedicated to improving the quality of healthcare settings
This accreditation is not required, but is desired by most healthcare organizations
Hospital may not receive reimbursement without accreditation (medicare)
The Joint Commission (TJC)
The totality of features and characteristics of a radiation therapy process that bear on its ability to satisfy stated or implied needs of patients
Quality
All those planned of systematic actions necessary to provide adequate confidence that a product or service will satisfy given requirements for quality
Important in therapy because you need to hit the right spot (lasers lined up) with right dose
Quality assurance (QA)
Operational techniques and activities used to fulfill those requirements for quality (tests, procedures, etc.)
Ex: 9 penny test for congruence
Quality control (QC)
Type of radiation therapy in which a very few high doses of radiation are delivered to small, well-defined tumors
Stereotactic body radiation therapy (SBRT)
Measurable dimensions of quality that defines what is to be monitored; get from QA
Measurement tool used to evaluate an organization’s performance
Quality indicators (QI)
Systematic collection of data and QI encompasses the activities directed to improve the quality of a system by reducing the error or variation of that system (same as quality assurance)
Quality assessment (QA)
3 other names for quality improvement (QI)
Continuous quality improvement (CQI)
Continual improvement (CI)
Total quality management (TQM)
What is the daily quality indicators (QI) output?
3%
5 members of the quality improvement (QI) team (all personnel who interact with patients and families)
Staff physicians Physics (physicists, engineers, dosimetrists) Radiation therapists Oncology nursing Support staff
What is the responsibility of the staff physicians on the quality improvement (QI) team?
Do weekly chart rounds with dosimetrists, therapists, etc. to see if treatment plan has changed (boost) and needs re-simmed
Initial or images taken through treatment to make sure the right place is still being treated
Port film/portal image
What are the responsibilities of the physics team on the quality improvement (QI) team?
Equipment, weekly chart check
What are the responsibilities of the radiation therapists on the quality improvement (QI) team?
“Gatekeepers”; morning warmups, sim QA, verifying prescriptions
What are the responsibilities of the oncology nurses on the quality improvement (QI) team?
Evaluate physical and psychology of patients; education of patients (skin care, diet, etc.)
2 things TJC requires the medical directors to do
Make sure staff is qualified (trained, credentials)
Establishment and continuation of quality improvement (QI) plan
5 QA activities that are the responsibilities of members of the QA committee
Develop and monitor a QA program Collect and evaluate data Determine areas for improvement Implement change as necessary Evaluate results of actions taken
What is the goal, frequency, and reporting mechanism of developing and monitoring a QA program
Goal: oversee departmental peer-review activities
Frequency: ongoing
Reporting mechanism: QA committee meeting minutes
What is the goal, frequency, and reporting mechanism of collecting and evaluating data for QA?
Goal: develop and implement new policies and procedures as needed
Frequency: monthly meetings
Reporting mechanism: chart rounds reports
What is the goal, frequency, and reporting mechanism of determining areas for improvement for QA?
Goal: oversee implementation of and adherence to departmental policies and procedures
Frequency: monthly meetings
Reporting mechanism: policies and procedures
What is the goal, frequency, and reporting mechanism of implementing chance as necessary and evaluating results of actions taken for QA?
Goal: oversee implementation of and adherence to departmental policies and procedures
Frequency: monthly meetings
Reporting mechanism: incident reports
8 components of a continuous quality improvement (CQI) plan
Evaluation of both quality and appropriateness of care (peer review)
Evaluation of patterns or trends
Assessment of individual clinical events
Action to be taken to resolve identified problems
Identification of important aspects of care for assessment
Identification of indicators to monitor and of acceptable thresholds
Methods of data collection
Annual review of quality improvement plan for effectiveness
What is the frequency, tolerance and who is responsible for the quality checks of the collision/door interlocks and warning lights and sounds for kilovolt and megavolt in-room CT imagers?
Frequency: daily
Tolerance: functional
Person responsible: therapist
What is the frequency, tolerance and who is responsible for the quality checks of the laser/image/treatment isocenter coincidence and phantom localization and couch shift for kilovolt and megavolt in-room CT imagers?
Frequency: daily
Tolerance: +/-2 mm
Person responsible: therapist
What is the frequency, tolerance and who is responsible for the quality checks of the kV/MV/laser alignments and accuracy of couch shift motion for kilovolt and megavolt in-room CT imagers?
Frequency: monthly
Tolerance: +/-1 mm
Person responsible: therapist or physicist
What is the frequency, tolerance and who is responsible for the quality check of the high-contrast spatial resolution of kilovolt and megavolt in-room CT imagers?
Frequency: monthly
Tolerance: ≤2 mm
Person responsible: physicist
What is the frequency, tolerance and who is responsible for the quality checks of the CT number accuracy and noise and uniformity of kilovolt and megavolt in-room CT imagers?
Frequency: monthly
Tolerance: baseline
Person responsible: physicist
What is the frequency, tolerance and who is responsible for the quality checks of the imaging dose and x-ray generator performance (kV only) of kilovolt and megavolt in-room CT imagers?
Frequency: annually
Tolerance: baseline
Person responsible: physicist
What is the frequency and tolerance of the QA procedure for the localizing lights of fluoroscopy-based simulators?
Frequency: daily
Tolerance: 2mm
What is the frequency and tolerance of the QA procedure for the field size indicator of fluoroscopy-based simulators?
Frequency: monthly
Tolerance: 2mm
What is the frequency and tolerance of the QA mechanical checks of the collimator, gantry, and couch rotation isocenter of fluoroscopy-based simulators?
Frequency: annually
Tolerance: 2-mm diameter
What must the homogeneity results be for CT scanners as recommended by the American Association of Physicists in Medicine (AAPM)?
Must be within 5 Hounsfield units (HU)
Daily tolerance of the alignment of gantry lasers with the center of the imaging plane for QA procedures of CT simulators
+/-2 mm
Monthly and after laser adjustments tolerance of the orientation of gantry lasers with respect to the imaging plane for QA procedures of CT simulators
+/-2 mm over the length of laser projection
Monthly and after laser adjustments tolerance of the spacing of lateral wall lasers with respect to lateral gantry lasers for QA procedures of CT simulators
+/-2 mm and scan plane
Monthly and after laser adjustments tolerance of the orientation of wall and ceiling lasers with respect to the imaging plane for QA procedures of CT simulators
+/-2 mm over the length of laser projection
Monthly or when daily laser QA tests reveal rotational problems tolerance of the orientation of the CT scanner tabletop with respect to the imaging plane of CT simulators
+/-2 mm over the length and width of the table top
Monthly tolerance of the table vertical and longitudinal motion for QA procedures of CT simulators
+/-1 mm over the range of table motion
Semiannual tolerance of the sensitivity profile width of QA procedures of CT simulators
+/-1 mm of nominal value
Annual tolerance of table indexing and position of QA procedures of CT simulators
+/-1 mm over the scan range
Annual tolerance of gantry tilt accuracy of QA procedures of CT simulators
+/-1 degree over the gantry tilt range
Annual tolerance of gantry tilt position accuracy of QA procedures of CT simulators
+/-1 degree or +/-1 mm from nominal position
Annual tolerance of scan localization of QA procedures of CT simulators
+/-1 mm over the scan range
Annual tolerance of radiation profile width of QA procedures of CT simulators
Manufacturer specification
Tolerance after replacement of major generator components of QA procedures of CT simulators
Manufacturer specification or AAPM report 39 recommendations
Daily dosimetry tolerance for non-IMRT, IMRT, and SRS/SBRT machines of x-ray output constancy (all energies) and electron output constancy (if not equipped, then weekly) for QA procedures of medical accelerators
3%
Daily mechanical tolerance for non-IMRT machines of laser localization, distance indicator (ODI) at isocenter, and collimator size indicator for QA procedures of medical accelerators
2 mm
Daily mechanical tolerance for IMRT machines of the distance indicator (ODI) at isocenter and collimator size indicator for QA procedures of medical accelerators
2 mm
Daily mechanical tolerance for IMRT machines of laser localization for QA procedures of medical accelerators
1.5 mm
Daily mechanical tolerance for SRS/SBRT machines of laser localization and collimator size indicator for QA procedures of medical accelerators
1 mm
Daily mechanical tolerance for SRS/SBRT machines of the distance indicator (ODI) at isocenter for QA procedures of medical accelerators
2 mm
Grainy appearance of an image
Image noise
Clarity of an image; relationship between the number of pixels or voxels
Resolution
Pixels of gray on image; represent various tissue densities and linear attenuation coefficients
Range from +1000 to -1000
Air = -1000, water = 0, bone = about 650-1000
Hounsfield Units (HU)
Projects a scale onto the patient’s skin that corresponds to the SSD used during the simulation or treatment process; tells us how deep we’re going
Optical distance indicator (ODI)
Process for continuously monitoring the movement of tumors during the patient’s breathing
Respiratory gating
The software and hardware requirements of a linac which provides the user daily image verification capabilities
On-board imaging (OBI)
First step in treatment planning that localizes a target volume and helps physician’s and staff come up with treatment planning
Simulator
About what percent of cancer patients will be treated with radiation at some point?
50-60%
Conventional = mechanical C-shaped device that supports the x-ray tube and collimator device at one end
CT = circular ring housing the x-ray tube and solid state detectors
Rotates 360°
Rotates around a fixed point in space known as the isocenter (100 cm)
Gantry
6 basic elements of a simulator
Gantry Patient support assembly (PSA) X-ray tube Collimator device Imaging system of fluoroscopy unit Optical devices
Allows the tabletop its mobility, permitting the precise and exact positioning of the isocenter during simulation or treatment
Couch/table
Where patient is positioned
Don’t want it to attenuate beam
Conventional CT table is curved so you have to place a hard, flat insert if you’re using it for simulation
Patient support assembly (PSA)
Arrangement of shielding material used to define the “x” and “y” dimensions of the beam of radiation
Attached to gantry and rotates 360°
Collimator device
Field defining lights/lasers
Optical devices
3 steps of treatment planning
Tumor localization
Computation of dose distributions (isodoses to tumor and critical structures)
Fabrication of treatment aids (ex: bolus)
Determine the extent of the tumor and location of critical structures
Tumor localization
Tells distance from source to depth of isocenter
Source skin distance (SSD)
Image from CT simulator
Digitally reconstructed radiograph (DRR)
Designed to simulate the mechanical, geometrical, and optical conditions of various treatment units
Conventional simulator
3 mechanical components of the gantry of a conventional simulator
Gantry arm
Gantry head
Image intensifying/film holder screen
C-shaped structure of the gantry of a conventional simulator
Gantry arm
2 edges of the beam
Divergent edges
Nondivergent = central axis
2 scales
IEC
Varian
Does the SSD or SAD method of treatment take longer?
SSD takes longer because the tumor is still in the patient and distance is further than SAD
6 gantry head components
Collimator assembly ODI Field defining wires Beam restricting diaphragms Fudicial plate Accessory holder
6 steps of patient’s process through the oncology department
Diagnosis Consultation Simulation Treatment planning (dosimetrist) Treatment Follow-up
Daily QA safety tolerance for NON-IMRT,IMRT, and SRS/SBRT machine of the door interlock (beam-off), door closing safety, and audio/visual monitors?
Functional
Compromises the gantry head and rotates around the isocenter
Collimator assembly
Not on treatment machine, represent diaphragms
If blocks were used on conventional simulation, you couldn’t see as much anatomy on the x-ray film
Field defining wires
Defines size and axis of the x-ray beam
Beam restricting diaphragms
Collimators
Shutters
Blades
Plate with hash marks that is used to measure on port films
Allows us to make shifts (point of measurement) and helps measure magnification
Made of plexiglass or plastic and is removeable (if it is left in the treatment field, it will absorb some of the radiation and the patient won’t receive the right dose)
Fiducial plate/reticule
Holds blocks, cones, etc. for treatment; have to keep distance the same
Accessory holder
OFD
Object-film distance (larger = more magnification)
SFD/TFD
Source/target-film distance
Distance from the radiation source to the patient’s skin
Source-skin distance (SSD)
DIstance from the source of radiation to the patient’s skin
Source-axis distance
FAD
Focal spot-axis distance
Line perpendicular to the cross-section of the simulation or treatment field; not divergent
Central axis (CA)
Patient thickness; measurement used for treatment planning purporses to determine the thickness of a body part from entrance to exit point, often measured along the CA
Intrafield distance/separation
Tabletop to isocenter
TT
Lasers that project a small red or green beam of light toward the patient during the simulation process; provide the therapist several external reference points in relationship to the position of the isocenter
Positioning laser
The procedure room must be a minimum what square feet?
400 ft^2
4 room shielding materials
Lead
Concrete
Borated polyethylene
Aqueous materials (for neutrons)
How much the primary beam is pointed toward an area in the room (wall, floor, etc.)
Use factor (U)
Fraction of time an area is occupied by people; full = shielding increase
Occupancy factor (T)
How often treatment machine is running
Time integral of the absorbed dose rate (cGy per minute or rad/min) determined at the depth of maximum absorbed dose, 1 m from the “source”
Workload (W)
Limited access area in which the occupational exposure of personnel to radiation producing equipment or radioactive materials is supervised by an individual in charge of radiation protection (ex: treatment room, control console); allows more dose
Controlled area
2 factors of permissible dose (P)
Controlled area
Uncontrolled area
Limit for controlled area
0.1 rad/wk
Any area in the environment (ex: lobbies, offices, waiting rooms, etc.); limits dose
Uncontrolled area
Limit for uncontrolled area
0.01 rad/wk
Distance from radiation source
Distance (d)
What’s being allowed to transmit; transmission determines barrier thickness/shielding (radiation)
Barrier transmission (B)
Shielding has to be how high?
Up to 7 ft
Barriers/walls that intercept the primary beam
Portions of the floor, ceiling, and walls that receive the primary barrier
Primary barrier/wall
Barriers/walls that receive only leakage and/or scatter radiation
Secondary barrier/wall
Beam emitted directly from the accelerator that is “aimed” at the patient (i.e. the treatment field)
Primary beam
“Useful beam”
Radiation that arises from radiation interactions in the treatment head
Leakage radiation
Operates with treatment planning computer; make marks and set up treatment field
Creates DRR; physician can define target volume in 3D
Virtual simulation (current method)
Barrier transmission (B) formula
B=Pd^2/WUT
P = permissible dose d= distance W = workload U = use factor T = occupancy factor
How big is the bore in CT simulation and why?
80-90 cm to fit treatment devices and different patient positions
The delivery of interventions aimed at relieving symptoms and side effects of the disease and treatment and improving quality of life for the patient
Palliative