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Imaging of Gastrointestinal System
義大醫院 影像醫學科 李浩銘醫師
Plain Photo
EUS
Fluoros copyNuclear Medicine
Ultrasound CT Scan MRI
Digestive system:
Digestive tracts:- Oral cavity- Pharynx- Esophagus- Stomach- Small bowel- Large bowel (Colon)- Rectum
Accessories organs:- Parotids- Liver- Billiary- Pancreas
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Plain abdominal x-ray
Technique :AP – Supine
AP – Erect
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LLD
Semi recumbent
CXR
Indication :Acute abdomen
What to Examine ??
- Air (bowel gas)
- Bone density
- Calcification (stone / foreign body)
- Soft tissue mass
Air
Sub diaphragm free airBowel perforation
Bowel obstruction
AP-semirecumbent
LLD, horizontal
AP-supine
-dilated bowel loops -thickening of bowel wall-multiple air-fluid levels
Ileo-cecal valveincompetentsmall and largebowel distention
Bowel obstruction
Mechanical large bowelobstruction
Colon dilatation
obstruction.
Barium enema
volvulus of sigmoid colon
Bone density
- Osteoporosis- Compression fracture
Calcifications, stones Soft tissue mass
Barium Enema (BE)
Plastic irigator :1. enema tip2. enema tube3. enema reservoir bag4. balloon with it inflator.
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Colon Radiology Anatomy
Technique & positioning
A.
Left lateral position :contrast filling rectum and rectosigmoid
B.
Left posterior oblique:contrast filling sigmoid
C.
Left lateral with 15o
Trendelenberg position :contrast flow to descendentcolon and splenic flexure
D.
Clockwise to prone position:contrast filling transversalcolon
E.
Clockwise to right lateralwith 15o Trendelenberg
position : contrast filling thehepatic flexure
F.
From E, turn left to supineposition : contrast fillinghepatic flexure andascendant colon
ContrastSingle DoubleBarium Barium + air
Contrast Single Double Motility study Mucosa study Simple & relative safe More difficult
IndicationDouble contrast BE
Melena / bloody stool
Cancer
Suspected colonic polyp
Family hx of colon ca / polyp
Chronic diarrhea / bowel habit change
IBD (inflamatory bowel disease)
Pain & abdominal discomfort
Diverticulosis
Intussusceptions
Hirschprungs disease
Fatique / very old patient /
serious illness
Suspected pelvic metastasi
s
IndicationSingle contrast BE
Contraindication
Suspect bowel perforationToxic megacolonAfter colonic biopsyPregnant Patient
Complication
Gas pain
Colonic perforation/rupture
Intramural barium
Stool impaction
Bacterial contamination
Allergy / hypersensitivity
Patient preparation
Low residue dietIncreased fluid intakeRectal or oral laxativeAntispasmodic agent (if needed)
1. Glucagon: iv 0.5 – 1 mg2. Buscopan: iv or im 1 amp (20 mg/mL)
Record / filming
Plain abdominal photo
Spot photo
Overhead whole abdomen
Plain abdominal photo
Barium EnemaSingle
Contrast
Spot film : Single contrast
Rectum (left lateral)
Hepatic flexure
Sigmoid Splenic flexure
Cecum
Whole abdomen : single contrast
Whole colon :
overhead film
BariumEnemaDouble
Contrast
Spot film : double contrast
Rectum & sigmoid :
Lateral position Supine position Prone position
Spot film : double contrast
Sigmoid :
posterior oblique
Distal descendant colon Proximaldescendant colon
Spot film : double contrast
Splenic flexure(RPO)
Transverse colon
Erect position
Spot film : double contrastAscendant colon
Hepatic flexure
Erect position Erect position, LPO
Spot film : double contrast
Cecum & appendix Cecum & terminal ileum
Overhead film :
whole colon
Hirschsprung diseaseDilatation of proximal bowel with caliber change at rectumTransitional zone
Intussusception
Doughnut Sign
Polyp
Bubble
Filling defect
Pedunculated Polyp
Sessile Polyp
Mexican hat sign
Malignant polyp : villous type
Apple core sign
Colon cancer : annular type
Colonic diverticulitis
Colonic diverticulosis
Ulcerative colitis
Continuous lesion, lead pipe sign
Segmental colitis Pancolitis
Crohn’s diseaseDiscontinuous skip lesion
Fistula formation
Colitis TB
Rectal carcinomaOverhanging edges / shoulderingAnnular constrictionIrregularity border
Colonic polyp
Filling defect on single contrast Soft tissue mass on double contrast
Extraluminal tumor
ileocecal intussusceptions(Coiled spring appearance)
Digestive system:
Digestive tracts:- Oral cavity- Pharynx- Esophagus- Stomach- Small bowel- Large bowel (Colon)- Rectum
Accessories organs:- Parotids- Liver- Billiary- Pancreas
Diffuse esophageal spasm:corkscrew esophagus
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Foreign body
Mimicking tumor
Intraluminal filling defect
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Gastric wall filling defect
Gastric carcinoma
Linitis plastica
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Additional shadow
Duodenum diverticulosis
3. Small Intestines
Barium follow through (Single Contrast)
Enteroclysis (Double Contrast)
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Barium Follow Through
• Patient fasting
• Single contrast : 200 – 500 cc of bariumsuspension is given to drink
• Followed by fluoroscopic or conventional x- ray.
• Taken serial photo : 5‘ , 10’, 20’ etc.
• Examination must be stop when barium fillingthe cecum.
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Enteroclysis = small bowel enema
• Inserted the NG Tube (12F 135 cm long)
• Maneuver catheter tip to the antrum passing pylorus placed and fixationcatheter tip in duodenal 3rd parts.
• Contrast irrigation (+ methylcellulose) orair insufflating
• Filming
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Normal follow through
Enteroclysis - normal smallbowel mucosa
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ascariasis in small intestine24
Take home message
• ABCS in KUB
• Single v.s Double contrast
• Indication / Contraindication / Complication of barium enema
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