Gastric Empty

Question 1

RP

Dose

TTI

Answer 1

• Solid Phase - 0.5-1.0 mCi Tc SC
• Tagged to 1-2 eggs
• Liquid Phase - 100-200 uCi Tc SC or In111 DTPA
• In 120 mL water, juice, milk (~4 oz)
• Image Immediately

Question 2

Indications

Answer 2

• Eval of: nausea, vomiting, weight loss, bloating, chronic aspiration
• Assess mechanical, anatomical obstruction of stomach
• Suspected gastroparesis
• GERD
• Dumping syndrome

Question 3

Contraindications

Answer 3

• Allergic to eggs
• Hypoglycemic patients – can have OJ 2 hours prior

Question 4

Patient Prep

Answer 4

• NPO 4-12 hours
• No smoking while NPO
• Must eat entire meal w/i 10 min
• Vomiting at any time invalidates
• Upright between scans - Stats
• DC sedatives

Question 5

Positioning

Answer 5

• Patient supine OR hugging detector
• Images taken ANT/POS.
• Geometric mean with both - Statics only
• GM for attenuation correction

Question 6

Target Organ

Critical Organ

Route of Excretion

Localization

Answer 6

Target: Stomach and Intestines

Critical: Esophagus, Stomach, bowel

Excretion: Bowel

Localization: Compartmentalization

Question 7

Procedure

Answer 7

• Image Immediately after meal
• Dyn: 60 s/f for 90-120 f
• Stat: A/P at 0,1,2,4 hours
• Patient must be upright between images
• IF stomach >95% empty at 60 min, DC study

Question 8

Acquisition

Answer 8

• LEAP/LEHR for Tc
• MEGP for In11
• Liver/GI - ANT Gastric Empty
• 128x128

Question 9

Processing

Answer 9

• JS - Dynamic Gastric - AB
• Peg: Gastric Analysis - gastric Empty - Gastric Normal
• Xel - MG 8 LIQUID - AB

Question 10

Normal

Answer 10

Solids: 32-120 min/ 63% in an hour

Liquid: 10-45 min/ 80% in an hour

Question 11

Treatment

Answer 11

• Medication
• Surgery
• Dietary restrictions
• Lifestyle changes

Question 12

Labels

Answer 12

• Name
• DOB
• MRN
• Date of exam
• Hospital
• Referring physician
• Dose
• Dose rate
• Frame rate
• Right/Left
• View ID
• Tech Initials