1. This lateral fluoroscopic image is from a swallowing dysfunction study performed with a speech-language pathologist. Why is the lateral projection the primary view for this study?
Modified barium swallow (swallow study)
The modified barium swallow (MBS), also called a videofluoroscopic swallow study (VFSS), watches the act of swallowing itself to see whether food or liquid goes into the airway. A speech-language pathologist (SLP) runs the study with the radiologist or radiologist assistant; you set up, run or record the fluoro, and position the patient.
What the ARRT tests
- The SLP decides the bolus types and order; the study is about the swallow (oral and pharyngeal phases), not the esophagus or stomach.
- Patient seated or standing upright in a lateral position first; an AP view may be added.
- Field of view: lips anteriorly, the nasopharynx (soft palate) superiorly, the cervical spine posteriorly, and down to the cervical esophagus (about C7).
- Penetration: material enters the laryngeal vestibule but stays above the vocal folds. Aspiration: material passes below the vocal folds into the trachea.
- Recorded continuously (often 30 frames per second) so the swallow can be replayed; use pulsed fluoro and the lowest rate that still answers the question.
Why it's done
- Coughing or choking when eating or drinking, a wet voice after swallowing, or repeated pneumonia that may come from aspiration.
- Stroke, head and neck cancer or its treatment, Parkinson's disease, dementia, and other neurological conditions that weaken the swallow.
- Deciding what diet is safe (thin liquids, thickened liquids, purees, solids) and which swallowing techniques help.
Who's in the room
- Speech-language pathologist (SLP)
- Prepares the boluses, feeds the patient, tries swallowing strategies, and writes the diet recommendation.
- Radiologist or radiologist assistant
- Runs or supervises the fluoro and reviews the study (the setup varies by hospital).
- Radiographer (you)
- Sets up the room and chair, positions the patient, runs or records the fluoro, and handles radiation protection.
Step by step
- Before. Confirm the order and that the patient can sit upright. Set up the special swallow chair or a chair between the table and the tower. The SLP brings barium in different thicknesses (thin, mildly and moderately thick, puree; older labels nectar and honey) and a solid such as a cookie coated with barium paste.
- Lateral. Patient upright and lateral. Collimate from the lips to the back of the cervical spine, and from the soft palate to the cervical esophagus. The SLP gives small, measured boluses, then larger ones, while you record each swallow.
- Strategies. The SLP may have the patient tuck the chin, turn the head, or swallow twice to see whether a technique keeps the airway clear.
- AP (if needed). Patient turned to face the tube for an AP view of the pharynx, showing whether one side of the swallow is weaker.
- After. Save the recording, record fluoro time, and help the patient back to the stretcher or wheelchair. The SLP gives the diet plan.
Your job
- Chair and fluoro tower ready before the patient arrives; many patients come from the floor in a wheelchair.
- Keep the anatomy in the field as the patient moves forward with each bite.
- Record every swallow; a missed swallow means another bolus and more dose.
- Lead apron and thyroid shield for everyone in the room; the SLP stands close to the patient.
Watch out for
- Aspiration: if the patient coughs hard or desaturates, stop and let the SLP and radiologist decide whether to continue. Have suction available.
- Weak or confused patients can slide in the chair; secure them and stay close.
- Do not confuse this with an esophagram: if the order or history really asks about the esophagus or reflux, check with the radiologist.
Tips from the room
- Ask the SLP before the study what they want to see; they will tell you when to start and stop recording.
Images
Quick check
2. During a modified barium swallow, which team member typically selects the bolus consistencies and tests swallowing strategies while the radiographer positions the patient and records the study?
3. During a modified barium swallow, which bolus is used to evaluate chewing and the oral preparation of a solid?
4. Why is a modified barium swallow recorded as continuous fluoroscopic video rather than documented with last-image-hold or spot images?
5. A patient is referred for a modified barium swallow rather than a routine esophagram. Which phases of swallowing are the main focus of the modified barium swallow?
Practice it in 3D
More in the guide
C-arm basics
The parts, the movements, the dose modes, and where to stand.
Sterile basics
What's sterile, what you can touch, and how to move around the field.
Esophagram and upper GI series
Barium swallow and UGI: why they're ordered, the positions, and your role.
Small bowel follow-through
Timed films as barium moves from the stomach to the colon.
Barium enema
Single- and double-contrast BE: prep, tip insertion, positions, and overheads.
Cystogram and VCUG
Bladder filled through a catheter: leak checks, reflux, and voiding images.
Hysterosalpingogram (HSG)
Uterus and fallopian tubes for infertility: timing, setup, and dose.
Arthrogram
Joint injection under fluoro, usually before MRI or CT.
Myelogram
Contrast in the spinal canal: needle site, table tilt, and keeping contrast out of the head.
Lumbar puncture (fluoro-guided)
Spinal tap under fluoro when bedside attempts fail.
ERCP and cholangiograms
Bile ducts through a scope, in surgery, or through a T-tube.
Hip pinning (hip fracture fixation)
The most common C-arm case: the fracture table, the two views, and your role.
Ankle and wrist ORIF
Open reduction and internal fixation of the ankle or wrist: the views, the mini C-arm, and hands in the beam.