GI tract/Biliary system Flashcards
3 pairs of salivary glands
Parotid-Lgst salivary gland
Submandibular
Sublingual-Smallest salivary gland
1 L of saliva is produced daily
Opening of parotid duct
Stenson’s duct opens into oral vestiblue opposite the 2nd molar
Larynx:
Voice organ
Pharynx:
Passageway for food & air
The liver is mostly located:
Upper right quadrant
Biliary tree components:
L & R Hepatic Ducts
Common hepatic duct
cystic duct
Common bile ducct
pancreatic duct
hepatopancreatic ampulla
sphincter of oddi
Identify cross sectional image of liver…
An image of an abdomen should demonstrate…
Psoas muscles
lower boarder of liver
kidneys
ribs
transverse process of vertebrae
free air
air fluid levels
Prime considerations for positioning a KUB
Hypersthenic pts require 2 CW abdomen projections
Taller pts may require a separate bladder shot
Upright abdomen positioning, breathing instructions and “look for”
IR centered 2” above iliac crests
high enough to include the diaphragm
suspend on expiration
look for free air or hiatal hernia
Horizontal beam placement for which ABD projections
Lataral dorsal decubitus
L Lateral decubitus
PA/AP upright
What is the default position for a decub abd image if not specified & why?
L Lateral decubitus
Air fluid levels only see with right side up
Pre exposure delays before imaging the abd for suspected large and small amounts of air/gas:
Patient in dorsal decubitus (supine) position at least 11-20 min for intraperitoneal gas & 5 min for lg amounts of gas
Page 89
Name the organs in the pelvic cavity:
Rectum
Sigmoid
urinary bladder
reproducctive organs
Peritoneum
2 parted sac that encloses the abdominopelvic cavity
inner layer-visceral (organs) peritoneum
outer layer-parietal peritoneum
Which body plane is perpendicular to long axis of grid for lat abd?
MCP
Space behind peritoneum where the kidneys & pancreas lie
retroperitoneum
4 parts of the stomach
cardia-surrounds esophageal opening
fundus-fills L hemidiaphragm
Greater curvature is lateral
body-between fundus & pyloric portion
pyloric portion-between stomach & duodenum
Contrast media for upper GI tract:
single & double contrast studies
double contrast-includes barius & fizzies (gas producing substance)
Biphasic exam-single & double contrast combination in single exam
Respiration phase for imaging upper GI tract:
Quiet nasal breathing
pg 21
Patient pret for UGI in the am:
Food & fluids withheld after midnight or 8-9 hrs prior to exam
empty stomach
Body rotation for a PA Obl esophagus
what is the rotation degree
What does it demonstrate
RAO position rotated 35-40 degrees
Demonstrates esophagus between heart & spine
Advantages of double contrast technique for UGI….
Small lesions are less likely obscured & mucosal lining of stomach is easily visualized
What drug is given to relax the GI tract for a stomach exam?
Glucagon or other anticholinergenic meds are given to relax GI tract
What is the sagittal plane placement for a PA stomach & duodenum…
Sagittal Plane passing 1/2 way between vertebral column & L lateral boarder of abdomen, collimating to stomach when using 24x30
What is the sagittal plane placement for a PA stomach & duodenum using 35x43 imaging field
Sagittal plane passing 1/2way between vertebral column & L lateral boarder of abd, collimating to stomach when using 35x43
PA obl rotation of the stomach & duodenum
RAO rotated 40-70 degrees
demonstrates the pyloric canal, duodenall loop, & bulb
AP Obl rotation of stomach & duodenum
What degrees?
What does it demonstrate?
LPO rotated 30-60 degrees (45 is ave)
demonstate the stomach, barium in fundus, duodenal loop & bulb
right lateral stomach & duodenum visualizes
the anterior & posterior aspects of stomach, pyloric canal, duodenal bulb
`AP stomach & duodenum demonstrates
stomach
duodenal loop
barium filled fundus
body
pylorus
duodenal bulb
double contrast viualization
Which projection of the stomach demonstrated its anterior and posterior surfaces?
R lateral
Protrusion of the stomach through the diaphragm…
hiatal hernia
The formula for W/V % in contrast is…
% W/V = g/ml x 100
MBS is used to dx:
aspiration
Breathing instructions for soft tissue neck…
Expose during slow inspiration near end of inhalation also known as quiet breathing
Who normally participates in BA swallow exam?
Radiologist & RT
Who normally participates in MBS exam?
Speech pathologist
What is the valsalva maneuver?
What does it rule out?
forcible exhalation against a closed glottis also known as bearing down
used for esophagram to r/out reflux
PA stomach & duodenum demonstrates..
Stomach (air in fundus) & duodenal loop
ERCP
gallbladder images by U/S
RAO esophagus
Demonstrates esophagus between heart & spine
PA Obl stomach
RAO stomach (on stomach, prone)
Fundus-dome shaped highest point of stomach filled with air
Duodenal loop & bulb
PA stomach
Demonstrates stomach (air in fundus) & duodenal loop
R lat stomach
Allows stomach to hang free
look for cubed vertebrae
R retrogastric space, duodenal loop & duodenaljejunal junction with air and gas in fundus
AP Obl Stomach
LPO Stomach
Look for open z joints
(scottie dog)
Fundus filled with barium
AP stomach
Look @ spinous processes (centered) fundus filled with contrast
What is respiration phase for imaging upper GI tract
Suspend expiration
Decubitus
Always a horizontal CR
3 portions of small bowel:
duodenum
jejunum
ileum
Majority of small bowel is attached to the abdominal wall by?
mesentery
functions of small bowel:
digestion & absorption of food
Functions of large bowel:
reabsorption of fluids & elimination of waste products
Layers of the colon wall:
fibrous
muscular
submucosal
mucosal layers
The veriform appendix attaches to the:
posteromedial cecum
Opening/connection between small/lg intestine:
ileocecal valve
Sections of the colon
ascending
transverse
descending sigmoid
most common contrast medium used in the GI tract
single-barium sulfate
double-barium then air
List 3 methods to record/display the fluoroscopic image
TV
digital image camera
spot film camera
cine film
Patient prep for SBS:
Soft or low residue diet for 2 days before study
food and fluid withheld after evening meal on day B4 exam
breakfast withheld on day of exam
AP or PA scout (KUB) image may be done
cleansing enema for colon may be administered
How long (after patient drinks barium) until image #1 of the SBS:
First image taken 15 mins after ingestion
IR centering for delayed images on SBS:
center & iliac crests (KUB)
What do you do if there is excessive resistance or the patient experiences pain during enema tip insertion?
notify radiologist
It is recommended that the balloon is inflated by the
radiologist using fluoroscopy
patient position for enema tip insertion:
sims position (LAO)
Height of enema bag above table (anus):
no higher than 24” above level of anus
Centering of the 14x17 IR for AP/PA/OBL projections on a sthenic patient-BE exam:
IR centered @ iliac crests
Which projections best demonstrate the sigmoid colon region?
AP axial
PA axial
Degree & direction of CR angle for the PA axial colon; AP axial:
30-40 cephalic (AP)
Caudad (PA)
Degree of body rotation for OBL projections of the colon
35-45 degree RPO or LPO
What 3 projections best show the ascending colon
PA Obl (RAO) BEST
AP
PA
What projection normally best shows the right (hepatic)colic flexure
AP Obl (LPO)
PA Obl (RAO)
The PA Obl (LAO) projection usually demonstrates which colic flexure:
Left colic flexure
IR centering for a Lat rectosigmoid area
Centered to ASIS
List 2 projections that should demonstrate the right colic flexure
AP Obl (LPO)
PA Obl (RAO)
Define colostomy
piece of colon diverted to an opening in the abd to bypass damaged colon
Final images of the SBS may involve visualizing the:
ileocecal valve or terminal ileum
Define haustra:
series of pouches along lg intestine
Junction of ascending/transverse & transverse/descending colon regions:
R/L colic flexure
Know body habitus/colon location
Hyper-higher horizontal
asthenic-lower more midline
Maximum insertion depth of tip for a BE:
no more than 4”
Best demonstration of entire colon (minimal superimpostion) is the ____ or ____?
AP/PA
Supine vs. prone for SBS:
Supine-
Prone-supresses & improves image quality
slide 72 pg 140
Anatomy best visualized on Lat decub images using air:
side up=side of interest
R Lat decub=medial side of ascending colon & lat side of descending colon
L Lat decub=Lat side of ascending colon & medial side of descending colon
Posterior colon est seenon which 2 projections:
L or R ventral decubitus
PA Projection
Anterior view
Prone position

L Lateral projection
L Lateral position
Lateral view

AP Projection
R lat decub
Posterior view

AP Obl projection
LPO/RAO position
Posterior Obl view

AP Obl projection
RPO/LAO position
Posterior Obl view

PA axial
PA axial

What is the largest salivary gland?
Parotid
What is the smallest salivary gland?
Sublingual