Transthoracic Echocardiography: Views & Tips for Optimal Imaging

A complete transthoracic echocardiogram is built from four standard transducer windows — parasternal, apical, subcostal, and suprasternal — each providing views of the heart from a genuinely different angle. This tutorial covers the standard views within each window, how to acquire them (including transducer marker orientation, a common point of confusion between similarly-named views), and practical tips for optimizing image quality. For the step-by-step scanning sequence most labs follow during a routine study, see the Transthoracic Echocardiography: Acquisition Protocol technique page, and for how a completed study becomes a structured report, see Transthoracic Echocardiography: Reporting.

Standard Terminology for Transducer Movement

Before the views themselves, it’s worth knowing the standardized vocabulary ASE uses to describe how the transducer moves — precise language here makes both teaching and troubleshooting a difficult view far more efficient than “wiggle it a bit”:

Term	Description
Tilt	The transducer stays in the same position, but its face moves to demonstrate a different imaging plane along the same axis
Sweep	A deliberate, continuous movement capturing a video clip across multiple anatomic planes
Rotate	The transducer stays in a stationary position while the index marker is turned to a new orientation
Slide	The transducer moves across the skin surface to an entirely new position
Rock	Within the same imaging plane, the transducer angles toward or away from the marker direction
Angle	The transducer stays at the same skin location, but the beam is directed to show a different structure

1. Parasternal Views

The transducer is placed on the left side of the chest, near the sternum, typically the 3rd or 4th intercostal space, with the patient in the left lateral decubitus position to bring the heart closer to the chest wall.

A. Parasternal Long-Axis (PLAX) View

How to obtain: position the transducer at the left parasternal region with the index marker pointed toward the patient’s right shoulder, aligning the beam parallel to the long axis of the heart.

Structures visualized: LV, RV, LA, aortic valve, mitral valve, ascending aorta.

Applications: assessing LV and RV size and function, evaluating aortic and mitral valve abnormalities, detecting pericardial effusion — this is the primary view for the earliest, smallest amount of fluid, seen posterior to the LV. LV and aortic root dimensions are conventionally measured from this view.

B. Parasternal Short-Axis (PSAX) Views

How to obtain: from the same parasternal location as PLAX, rotate the marker toward the patient’s left shoulder — roughly a 90° rotation from the PLAX marker position — then sweep through multiple levels of the heart.

Levels visualized:

• Aortic valve level — aortic valve, tricuspid valve, right atrium, left atrium
• Mitral valve level — mitral valve leaflets (the classic “fish-mouth” appearance in diastole)
• Papillary muscle level — LV wall motion and thickness, at the level most commonly used for regional wall motion scoring

Applications: assessing global and regional LV function, evaluating aortic and mitral valve morphology. A zoomed PSAX view just superior to the aortic valve can also demonstrate the coronary artery origins — the right coronary artery typically arising around the 11 o’clock position and the left coronary artery around 5 o’clock — worth knowing as an advanced/supplementary view rather than part of the routine study.

2. Apical Views

The transducer is placed at the cardiac apex, typically near the point of maximal impulse.

A. Apical Four-Chamber (A4C) View

How to obtain: position the transducer at the apex with the beam directed toward the base of the heart. The index marker is placed at the 4–5 o’clock position — worth stating precisely, since this is a common source of confusion with the subcostal four-chamber view, which uses a different marker position (3 o’clock) despite the similar name. Center the interventricular septum in the sector to avoid foreshortening the true apex.

Structures visualized: all four chambers, the mitral and tricuspid valves.

Applications: assessing chamber size and function, evaluating valvular function, visualizing the interatrial septum for shunts such as an ASD or PFO.

B. Apical Two-Chamber (A2C) View

How to obtain: from the full A4C view, rotate the transducer approximately 60° counterclockwise.

Structures visualized: LV and LA only, along with the mitral valve and the inferolateral and anterior LV walls.

Applications: assessing regional wall motion abnormalities (particularly the inferior and anterior walls, best seen from this view), evaluating LA and mitral valve morphology.

C. Apical Long-Axis (Three-Chamber) View

How to obtain: from the A2C view, rotate a further 60° counterclockwise — the same magnitude and direction of rotation used to get from A4C to A2C in the first place.

Structures visualized: LV, LA, LV outflow tract, mitral valve, and aortic valve.

Applications: assessing LVOT, mitral valve, and aortic valve function together in one plane — this view is also where continuous-wave Doppler alignment with LVOT/aortic flow is typically most favorable.

3. Subcostal (Subxiphoid) Views

The transducer is placed below the sternum at the subxiphoid region, with the patient supine and knees bent to relax the abdominal wall.

A. Subcostal Four-Chamber View

How to obtain: position the transducer under the sternum with the beam directed cranially. The index marker is placed at the 3 o’clock position, pointing toward the patient’s left side.

Structures visualized: all four chambers.

Applications: assessing pericardial effusion, evaluating cardiac function when parasternal or apical windows are technically limited, detecting intracardiac shunts. This window is often the most reliable in patients with significant lung disease or a difficult body habitus, since it avoids intervening lung tissue.

B. Subcostal Short-Axis View

How to obtain: from the subcostal four-chamber view, rotate the transducer counterclockwise approximately 90° while maintaining the short-axis orientation, pointing toward the liver to bring the IVC into a long-axis view.

Structures visualized: all four chambers, the interatrial and interventricular septa, the IVC at its junction with the RA (useful for assessing collapsibility), and the pericardium.

Applications: global and regional right and left ventricular wall motion assessment, pericardial effusion evaluation, right heart assessment, IVC-based volume status assessment, and — particularly in pediatric practice — evaluation of septal defects and other structural congenital anomalies.

C. Subcostal Inferior Vena Cava (IVC) View

How to obtain: adjust the transducer to align the beam with the IVC and its junction with the RA.

Structures visualized: the IVC and its diameter change (collapsibility) across the respiratory cycle.

Applications: estimating right atrial pressure from IVC diameter and its collapse with a sniff or with quiet inspiration — see the Right Ventricle Evaluation tutorial for how this feeds into RA pressure and pulmonary pressure estimation.

4. Suprasternal Views

The transducer is placed in the suprasternal notch, just superior to the manubrium, with the patient’s neck extended.

A. Suprasternal Long-Axis View

How to obtain: position the transducer in the suprasternal notch with the face directed inferiorly — almost parallel with the neck — angled slightly posteriorly toward the aortic arch. The index marker points toward the patient’s left shoulder. Small rocking and angling movements are often needed to bring the best view of the arch into plane.

Structures visualized: the aortic arch and its branches, the superior vena cava, and the pulmonary artery in proximity to the arch.

Applications: assessing aortic coarctation, dissection, or aneurysm; visualizing flow patterns in the aortic arch; evaluating congenital defects such as a patent ductus arteriosus.

B. Suprasternal Short-Axis View

How to obtain: rotate the transducer approximately 90° from the long-axis position.

Structures visualized: transverse sections of the aortic arch and great vessels, the right pulmonary artery, and the superior vena cava — sometimes referred to informally as the “crab view” for its characteristic appearance.

Applications: evaluating flow disturbances associated with congenital heart defects.

Tips for Optimal Imaging

• Patient positioning — left lateral decubitus for the parasternal and apical windows (brings the heart closer to the chest wall and opens the intercostal spaces); supine, with knees bent, for the subcostal window; supine with the neck extended for the suprasternal window.
• Transducer selection — a lower-frequency phased-array probe (roughly 1–5 MHz in adults) balances the need for adequate penetration against resolution; see the Echocardiography Basics tutorial for the underlying frequency/resolution trade-off.
• Gain, depth, and focus — optimize at every window rather than relying on transducer position alone; endocardial border definition depends heavily on these settings.
• Respiratory technique, applied selectively — rather than a blanket instruction to hold the breath throughout the whole study, suspended respiration or held end-expiration is a targeted technique used for specific measurements where precision matters most — aortic root sizing and 3D volumetric acquisition among them. For general 2D scanning, quiet respiration is usually sufficient and more comfortable for the patient.

Summary

The parasternal, apical, subcostal, and suprasternal windows together provide comprehensive coverage of cardiac anatomy and function, each window offering views the others structurally cannot. Precise marker orientation — particularly distinguishing similarly-named views like the apical and subcostal four-chamber windows — and standardized movement terminology both make the difference between reliably reproducing a view and hunting for it freshly on every study. See Pediatric Transthoracic Echocardiography for how this framework extends — and where it differs — in children and congenital heart disease.