Optimizing CT Image Quality: CARE Dose 4D

November 2011 PART 3: CARE Dose4D AUTOMATIC EXPOSURE CONTROL (AEC) Automatic Exposure X-ray AEC Control  arcaY Consistent Quality Reference Image Quality mAs Ionization comprar SCR Modulation Strength Constant Image Receptor Dose kV selected by operator “How Much ” Radiation Should Be Used? 20 mAs 10 mAs NUMBER OF X RAYS PER UNIT ENERGY 25 50 75 X-RAY ENERGY (keV) mAs  Receptor Dose mAs Adjusted 5 Gy (Patient Size) Set ~ 120 kV CARE Dose4D Receptor Dose  5 Gy MOLTEO 200 mA  mA for  thickness 5 ms  mA for  thickness 1 mAs Part 3 (CARE Dose4D) Huda 1 November 2011 Adjust mA along patient Adjust mA around patient 100 = mAs per rotation 100 GO Adjusts Effective mAs Between Patients Tube modulation 75 kg constant current  Uniform “Dose”  “Dose”  X-ray Efficiency modulated current QUALITY REFERENCE mAs  Body CTDIvol Region Standard [75 kg] Diagnostic Task Adult Radiologist Never changed Preference for “a patient” Part 3 (CARE Dose4D) Huda 2 November 2011 Standard Adult Patient Head 120 kV CTDIvol [Eff mAs] CTDIvol is 60 mGy [S] [Effective mAs is 390] Scan Length (DLP) 17 cm scan Effective Dose (DLP 1000 mGy-cm) syngo CT 2011 A (Siemens Protocol) Effective Dose 2 mSv Chest Abdomen CTDIvol is 7.4 mGy [L] CTDIvol is 14 mGy [L] [Effective mAs is 110] [Effective mAs is 210] 30 cm scan 25 cm scan (DLP 220 mGy-cm) (DLP 350 mGy-cm) Effective Dose 4.5 mSv Effective Dose 5.7 mSv Pelvis Type of Examination Body region 12 Specified Head Neck Body Regions CTDIvol is 14 mGy [L] Shoulder Thorax [Effective mAs is 210] Abdomen Pehis Quality Reference Spine mAs 30 cm scan Osteo Head/Vascular Head (DLP 420 mGy-cm) Vascular Body Run Off Cardio Effective Dose 6 mSv Part 3 (CARE Dose4D) Huda 3 November 2011 Quality Ref mAs MODULATION STRENGTH Never changed for “a patient” FAST CARE syngo CT 2011 strong --- normal Very weak moderate. obese Weak consta Current Average nti dos Relative Tube Relative Patient Size Strong Very strong syngo CT 2010 or Older 3 curves Large Adult Body [75 kg  100%] Size “Small” Patients ≠ Very weak: 130% “Obese” Patients Weak: 140% wIs Small  Very Weak Average: 160% Strong: 180% Obese  Very Strong Tube Current Very strong: 220% Part 3 (CARE Dose4D) Huda 4 November 2011 Small Adult Body [75 kg  100%] Average Modulation Very weak: 80% Very small adult: 40% Weak: 70% Small adult: 60% Average: 60% 75 kg adult: 100% Strong: 50% Large adult: 160% Very strong: 45% Very large adult: 220% Obese adult: 300% Patient Age (Pediatric) image The Alliance for Radiation Safety in Pediatric Imaging gently" Tests/Procedures What Can I Do? Resources FAQ International Resources 1 Year 5 Year Old Old Quality Ref mAs (75 kg) Pediatric Head [Adult = 100%] Pediatric Body [Adult = 100%] Newborn: 75% Newborn: 40% 2 year old: 85% 1 year old: 50% 5 year old: 60% 6 year old: 95% 10 year old: 70% Part 3 (CARE Dose4D) Huda 5 November 2011 CARE Dose4D SUMMARY Image Gently image The Alliance for Radiation Safety in Pediatric Imaging gently" Tests/Procedures What Can I Do? Resources FAQ International Resources Stity dole  Weak or Very Weak Modulation With CARE Dose4D, mA is varied: Quality Ref. mAs for Average Adult 12 Body DO Around the patient Regions Along the patient Diagnostic Task Between Patients Radiologists CTDIvol Modulation (size) Five “strengths” Next CARE kV Obese & Small Pediatric CARE Dose4D M Part 3 (CARE Dose4D) Huda 6