At Tomo

Before Starting: powered up, software running, 5-minute warmup, AIRSCANS

Select Patient: ‘_CT Number Calibration’ [ normal pitch, 2mm slices x 19 ]

• Select all slices → Accept slices … Prepare scan → OK → Setup → Yes

Setup cheese phantom (+ PWx20), green lasers

• Main → Ready → Yes … Key → Image → Key
• Record air-HU and water-HU from screen → OK

Tools → Clear selected patient

Tools → Dicom Options → Export Items

• Export to: RaySearch … select correct ‘CTrue Image’ (4 slices)
• Send Now → Close

Insert density plugs w/test pattern pointed in, orient plug side into gantry

Cheese Phantom Inserts
Plastic Water
Cortical Bone
Liquid Water
Resolution Test Object
Air

Select Patient: ‘ZZ-06_TomoPhant’, plan-3

• ~20 slices covering inner part of plugs, fine pitch, 1mm slices
• Accept Slices … Prepare scan → OK → Setup → Yes
• Setup on green lasers … Main → Ready → Yes … Key → Image → Key

Tools → Clear selected patient

Tools → Dicom Options → Export Items

• Export to: RaySearch … Select CTrue Image,
• Send Now → Close

At RayStation

Patient Data / Patient Information

• Import new patient → [ ‘Storage SCP’, ‘_CT Number Calibration’, ‘CT Series’]
• ‘Import’ → if prompted, ‘Create a new patient’ then ‘OK’
• Image Sets / Properties
• confirm correct density table, then ‘OK’

Patient Modeling / Structure Definition / ROI Tools

• New ROI geometry / Structure templates / Create structures from template…
  • Template → ‘MVCT QA’
  • Initialization → ‘Align image centers’
  • Structures → ‘Select All’
  • OK, then confirm contour alignment
  • Double-click ROIs, record ‘Intensity Avg’, click ‘Cancel’
  • Center: 24.66 … calculate +/- 40 as HU range, e.g. -15 → 60

Cheese	Phantom
Q1	1.85
Q2	2.79
Q3	17.66
Q4	13.21

New ROI geometry / Thresholding / Gray level threshold …

Set threshold levels → ‘-15’ [HU] ‘60’

Output / Create geometry for: / Existing ROI → ‘+/- 40 HU’ and click ‘OK’

Are you sure that you want to replace the existing geometry: → ‘Yes’

New ROI geometry / Algebra and margins / ROI algebra …

• Expression A → ‘+/- 40 HU’
• Operator → ‘intersection’
• Expression B → ‘center_slice’
• Ouput → no expansion, Create geometry for: / Existing ROI / ‘noise_volume’ → OK

Are you sure that you want to replace the existing geometry: → ‘Yes’, long delay

Inspect ‘noise_volume’ for artifacts

Double-click ROIs, record ‘Volume [cm3]’, click ‘Cancel’

noise_volume	33.89
center_slice	45.30

Calculate %-enclosed: 78% vs tolerance of 65%,

Patient Modeling / Structure Definition / POI Tools

Adjust pin_1, pin_2, and pin_3 to center of metal pins in the image slice

Double-click POIs, record coordinates R-L, I-S, P-A, click ‘Cancel’

pin_1	9.37	0.05	11.23
pin_2	14.52	0.05	-2.63
pin_3	9.50	0.05	-11.37

Patient Data / Patient Information → ‘Close’

• Modifications must be saved before closing the current patient.
• Do you want to save the changes? → ‘Yes’

Patient Data / Patient Information

• Import new patient → [‘Storage SCP’, ‘ZZ-06_TomoPhant’, ‘CT Series’]
• ‘Import’ → if prompted, ‘Create a new patient’ then ‘OK’
• Image Sets / Properties
  • confirm correct density table, then ‘OK’

Patient Modeling / Structure Definition / ROI Tools

• Inspect for number of high-contrast objects visible: 4
• New ROI geometry / Create New ROI → ‘bone’, ‘liquid_water’, ‘air’
• Use the brush on single slice, structure covers about central half of the plug
• Double-click ROIs, record ‘Intensity Avg’, click ‘Cancel’

bone	651.48	11.23
liquid_water	6.44	-2.63
air	0.05	-911.74

At Excel