Ultrasound Scanning technique for Gall bladder

SONOACADEMY

CLINICAL ULTRASOUND

QUALITATIVE • QUANTITATIVE • INTERVENTIONAL ULTRASOUND

Scanning Sequence Patient Preparation Equipment Optimization Assessment Measurements Documentation Final Check

Gallbladder Ultrasound Scanning Technique

PATIENT PREPARATION • EQUIPMENT • IMAGE OPTIMIZATION • SYSTEMATIC SCANNING • BILIARY ASSESSMENT • DOCUMENTATION

ULTRASOUND SCANNING TECHNIQUE

SEARCH GALLBLADDER SCANNING TECHNIQUE

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SYSTEMATIC SCANNING PRINCIPLE: Use a consistent scanning sequence to evaluate the gallbladder, gallbladder neck, hepatic ducts and common bile duct in multiple planes. Adapt probe position, angulation, respiratory maneuver and patient position according to visualization and clinical requirements.

Longitudinal Scanning of the Gallbladder from the Right Subcostal Margin

Short-Axis Scanning of the Gallbladder by the Right Subcostal Margin

Short-Axis Scanning of the Gallbladder Neck by the Right Subcostal

Oblique Scanning of the Left and Right Hepatic Ducts by the Right Subcostal

Longitudinal Scanning of the Right Hepatic Duct from the Right Intercostal Space

Longitudinal Scanning of the Common Bile Duct by the Right Subcostal and Right Upper Abdomen

Longitudinal Scanning of the Intrapancreatic Portion and End Part of the Common Bile Duct by the Right Subcostal and Right Upper abdomen

Transverse Scanning of the Common Bile Duct at the Level of the Upper Part of the Pancreatic Head by the Right Subcostal

Transverse Scanning of the Middle Segment of the Common Bile Duct at the Level of the Lower Part of the Pancreatic Head by the Right Subcostal

PRE-EXAMINATION PRINCIPLE

Follow the local examination protocol and clinical indication. Explain the examination to the patient and obtain relevant clinical history before scanning.

Confirm patient identity and examination indication.

Review relevant symptoms, clinical history and previous imaging when available.

Explain the gallbladder and biliary ultrasound examination to the patient.

Use appropriate fasting instructions according to local protocol and clinical circumstances.

Position the patient comfortably, usually supine initially.

Be prepared to use left lateral decubitus or other positional changes when required.

Ask the patient to cooperate with respiration and breath-holding when necessary.

Expose the right upper abdomen appropriately while maintaining patient privacy.

Apply adequate ultrasound gel to obtain consistent acoustic coupling.

Use additional positioning and respiratory maneuvers when the gallbladder or biliary tree is poorly visualized.

Select an appropriate abdominal curvilinear transducer.

Use a suitable frequency range according to patient body habitus and required penetration.

Inspect the transducer surface and cable before use.

Confirm adequate acoustic coupling and apply sufficient gel.

Select an abdominal or hepatobiliary preset when available.

Confirm correct patient information on the ultrasound system.

Prepare Color Doppler when vascular or ductal differentiation is required.

Ensure measurement and image-storage functions are available.

Select an appropriate monitor display and examination environment.

Optimize the system before acquiring final diagnostic images.

1. Probe Orientation and Contact

Maintain correct probe orientation and consistent acoustic contact. Adjust probe pressure according to the target structure and patient's body habitus.

2. Depth Optimization

Adjust depth so the gallbladder, biliary tree and relevant surrounding anatomy are appropriately displayed without excessive unused field of view.

3. Overall Gain

Adjust overall gain to produce balanced grayscale visualization of the gallbladder wall, lumen, contents and surrounding liver.

4. TGC

Adjust time-gain compensation to maintain appropriate brightness throughout the depth of the image.

5. Frequency Optimization

Select the highest practical frequency that provides adequate penetration and visualization of the gallbladder and biliary structures.

6. Dynamic Range

Adjust dynamic range and compression to provide useful grayscale separation between bile, wall, stones, sludge and adjacent tissues.

7. Focal Zone

Place the focal zone at or near the region of interest when detailed evaluation of the gallbladder wall or lumen is required.

8. Zoom and Field of View

Use an appropriate field of view and magnify the gallbladder neck, wall, stones or biliary duct when detailed assessment is required.

9. Harmonic Imaging

Use available harmonic or other image-processing modes when they improve visualization without obscuring relevant findings.

Structure / Assessment	Technique Focus
Gallbladder	Evaluate the gallbladder in longitudinal and short-axis planes and document the lumen, wall and surrounding structures.
Gallbladder Neck	Obtain a short-axis view of the neck and use probe angulation or positional adjustment when required for adequate visualization.
Left and Right Hepatic Ducts	Use an oblique right subcostal approach to demonstrate the hepatic ducts and their relationship to the porta hepatis.
Right Hepatic Duct	Use the right intercostal approach when required to obtain a longitudinal view of the right hepatic duct.
Common Bile Duct	Evaluate the CBD longitudinally and transversely using right subcostal and right upper abdominal approaches.
Intrapancreatic CBD	Attempt visualization of the intrapancreatic portion and distal CBD using an appropriate right upper abdominal or subcostal approach.
Pancreatic Head Relationship	Assess the CBD in relation to the upper and lower portions of the pancreatic head.
Color Doppler	Use Color Doppler when needed to differentiate vascular structures from ducts or other anechoic structures.

ASSESSMENT NOTE:

Evaluate the gallbladder and biliary tree using multiple planes and appropriate patient positioning. Document technically adequate representative images according to the clinical indication and local examination protocol.

Select the appropriate anatomical plane before placing calipers.

Magnify the target structure when necessary.

Place calipers precisely on the intended anatomical margins.

Use a standardized imaging plane appropriate for the measurement.

Avoid unnecessary obliquity when a standardized plane is required.

Record measurements using the correct units.

Repeat measurements when the first acquisition is technically suboptimal.

Document the anatomical reference and imaging plane when appropriate.

Use consistent technique for follow-up examinations whenever possible.

Document relevant gallbladder and biliary measurements according to local protocol.

Document a representative longitudinal image of the gallbladder.

Document a representative short-axis image of the gallbladder.

Document the gallbladder neck when adequately visualized.

Document the gallbladder wall when assessment is required.

Document relevant gallbladder lumen findings.

Document the left and right hepatic ducts when assessed.

Document the right hepatic duct from the appropriate approach.

Document the common bile duct in longitudinal orientation.

Document the common bile duct in transverse orientation when required.

Document the intrapancreatic and distal CBD when adequately visualized.

Save measurement images with visible calipers and labels.

Save appropriate Color Doppler images when vascular differentiation is required.

GALLBLADDER SCAN COMPLETION CHECKLIST

Confirm that the required gallbladder regions, biliary ducts, scanning planes, measurements and representative images have been completed according to the clinical indication and local examination protocol.

Gallbladder longitudinal view obtained.

Gallbladder short-axis view obtained.

Gallbladder neck assessed.

Left hepatic duct assessed where required.

Right hepatic duct assessed where required.

Right intercostal approach used when required.

Common bile duct assessed longitudinally.

Common bile duct assessed transversely where required.

Intrapancreatic/distal CBD assessed where technically possible.

Pancreatic head relationship assessed where required.

Required measurements completed.

Required representative images saved.

Color Doppler used when indicated.

Final images reviewed for technical quality.

SONOACADEMY • CLINICAL ULTRASOUND

Gallbladder Ultrasound Scanning Technique • Systematic • Practical • Diagnostic