Quality Control - History Page

	Date/Time	Made By	Edit Note	Type	Scope
	Sep 16 2009, 8:21 AM EDT	eliseleblanc		edit	2 words added 2 words deleted
Change: used.scanned.Frequency: Weekly [2]Limits: ±4HUSpatial UniformityPurpose: Verify ability of the CT scanner to yield the same CT number regardless of location of the region of interest (ROI) within a homogenous object.Method: Uniform object is scanned. Mean HU View changes from previous version. (Word count: 745)
	Sep 16 2009, 8:18 AM EDT	eliseleblanc		edit	3 words added 3 words deleted
Change: phantomwater mayphantom beis used.Frequency: Weekly [2]Limits: ±4HUSpatial UniformityPurpose: Verify ability of the CT scanner to yield the same CT number regardless of location of the region of interest (ROI) within a homogenous object.Method: Uniform object is scanned. View changes from previous version. (Word count: 745)
	Jun 21 2009, 1:04 PM EDT	eliseleblanc		edit	187 words added 22 words deleted
Change: device containing one or two ramps positioned at an angle to the scan plane. For helical scanning, a test device consisting of a thin disk or band, mounted in a medium should be used. The disc should have a linear attenuation coefficient ≥ aluminum to ensure a high S/N ratio. View changes from previous version. (Word count: 745)
	Jun 21 2009, 11:28 AM EDT	eliseleblanc		edit	7 words added 6 words deleted
Change: [1]Frequency: DailyLimits: ±1.5HUSpatial uniformityPurpose: Verify ability of the CT scanner to yield the same CT number regardless of location of the region of interest (ROI) within a homogenous object.Method: Uniform object (air) is scanned. Mean HU View changes from previous version. (Word count: 580)
	Jun 19 2009, 11:03 PM EDT	eliseleblanc		edit
Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 579)
	Jun 19 2009, 11:02 PM EDT	eliseleblanc	Error	edit	1 word added 5 words deleted
Change: 2mm in thCT Numbers Purpose: Verify that CT#/HU of water is consistently 0 regardless of kV. Method: A water phantom is used. Frequency: DailyLimits: ±1.5 HU.1.5HUSpatial uniformityPurpose: Verify ability of the CT scanner to yield View changes from previous version. (Word count: 579)
	Jun 19 2009, 11:02 PM EDT	eliseleblanc	Some Safety Code 3	edit	109 words added 9 words deleted
Change: Internal and external laser lights are used for patient positioning/landmarking. This is especially important during CT biopsies or interventional procedures (1).Limits: ±2mmFrequency: Semi-anuallyLinear Length MeasurementLimits: ±1 mmFrequency: AnuallyAngle MeasurementLimits: ±1 mmFrequency: AnuallyReferences1. Papp, J. (2006). Quality Management View changes from previous version. (Word count: 583)
	Jun 19 2009, 10:27 PM EDT	eliseleblanc	Expanded info.	edit	317 words added 20 words deleted
Change: Ability to portray differences between two objects with similar LAC (linear attenuation coefficient) or densities. CT excels at contrast resolution because there are no overlying structures. Contrast resolution is effected by slice thickness, pt. size, detector sensitivity, algorithms used, what image display looks like, kV, mAs.Method: Contrast View changes from previous version. (Word count: 452)
	Jun 19 2009, 10:01 PM EDT	eliseleblanc	Breif descriptions	edit	149 words added
Change: Ability of the CT scanner to yield the same CT number regardless of location of the ROI within a homogenous objectNoiseObtaining the mean and SD of CT numbers within a ROI of a homogenous objectHVLTo verify kV and filtrationScout doseMeasure dose for scout image View changes from previous version. (Word count: 157)
	Jul 22 2006, 1:09 PM EDT	louisep	Rename	rename	No content added or deleted.
Change: Renamed from Quality Assurance Testing by louisep Jul 22 2006, 1:09 PM EDT for: Rename
	Jun 24 2006, 7:56 AM EDT	louisep		create	No content added or deleted.
Change: Created by louisep Jun 24 2006, 7:56 AM EDT for: no reason given