Ultrasound Practice Questions

Q: POCUS is related to which imaging modality?

Ultrasound. ***Ultrasound*** - **POCUS** stands for **Point-of-Care Ultrasound**, indicating that it is a direct application of ultrasound technology. - It involves using a portable **ultrasound machine** at the patient's bedside for rapid diagnostic and therapeutic guidance. *X-ray* - **X-ray** imaging uses ionizing radiation to create images of bones and some soft tissues, which is fundamentally different from ultrasound's sound wave technology. - It is not typically performed at the bedside as commonly as POCUS, and it provides static images rather than real-time dynamic views. *MRI* - **MRI** (Magnetic Resonance Imaging) uses strong magnetic fields and radio waves to produce detailed images of organs and soft tissues. - This modality requires specialized, large equipment and is not suitable for point-of-care use due to its size, cost, and complexity. *CT* - **CT scans** (Computed Tomography) utilize X-rays from multiple angles to create cross-sectional images of the body, providing detailed anatomical information. - Like MRI, CT scanners are large, expensive, and require a dedicated imaging suite, making them unsuitable for point-of-care applications.

Q: Pulse echo principle is used by which modality?

USG. ***USG*** - **Ultrasound (USG)** imaging relies on the **pulse echo principle**, where high-frequency sound waves are emitted and their reflections (echoes) are detected to create images. - The transducer sends out a short **ultrasound pulse** and then listens for the echoes returning from structures within the body. *X-ray* - **X-ray** imaging uses **ionizing radiation** to produce images, where X-rays pass through the body and are absorbed differently by various tissues. - It does not involve emitting pulses or detecting echoes; instead, it measures the **attenuation of X-rays**. *CT* - **Computed Tomography (CT)** also uses **X-rays** but in a cross-sectional manner, rotating an X-ray source and detector around the patient. - It reconstructs detailed 3D images based on varying **X-ray absorption** and does not use sound waves or the pulse echo principle. *MRI* - **Magnetic Resonance Imaging (MRI)** utilizes strong **magnetic fields** and **radio waves** to produce detailed anatomical images. - It measures the signals emitted by **protons in water molecules** after they are excited by radiofrequency pulses, which is distinct from sound wave echoes.

Q: Which of the following contrast agents is used in USG?

SonoVue. ***SonoVue*** - **SonoVue** (also known as Lumason in the US) is the most commonly used **microbubble contrast agent** specifically designed for **ultrasonography (USG)**. - Contains **sulphur hexafluoride gas microbubbles** stabilized by a phospholipid shell. - These microbubbles enhance the echogenicity of blood, improving the visualization of blood flow and tissue perfusion in various organs, particularly in **liver imaging** and **cardiac echocardiography**. - Other USG contrast agents include Definity and Optison. *Urograffin* - **Urograffin** (diatrizoate) is an iodine-based contrast agent primarily used in **X-ray imaging**, particularly for **urography (imaging of the urinary tract)** and **angiography**. - It is not suitable for USG as it does not produce the necessary acoustic impedance difference for ultrasound enhancement. *Omnipaque* - **Omnipaque** (iohexol) is a non-ionic, low-osmolar **iodinated contrast agent** used for various **X-ray and CT procedures**. - Like other iodinated agents, its properties are optimized for X-ray attenuation, not for ultrasound enhancement. *Conray* - **Conray** (iothalamate) is an older generation, high-osmolar, **iodinated contrast agent** used for various **X-ray procedures** like angiography and CT scans. - Similar to Urograffin, it works by X-ray attenuation and is not effective for ultrasound contrast enhancement.

Q: Ultrasonography transducer contains –

Lead Zirconate. ***Lead Zirconate*** - **Lead Zirconate Titanate (PZT)** is a widely used **piezoelectric ceramic** material in ultrasound transducers due to its strong piezoelectric properties. - This material converts electrical energy into mechanical vibrations (sound waves) and vice-versa, which is crucial for generating and detecting **ultrasound images**. *Sodium fluoride* - **Sodium fluoride** is not a **piezoelectric material** and therefore cannot be used to generate or detect ultrasound waves. - It is primarily known for its use in **dental care** for strengthening tooth enamel. *Caesium fluoride* - **Caesium fluoride** is an **ionic compound** and does not possess the **piezoelectric properties** required for ultrasound transducer functionality. - It is used in various chemical applications but not in medical imaging transducers. *None of the options* - This option is incorrect because **Lead Zirconate** (specifically as PZT) is a fundamental component of most modern ultrasound transducers.

Q: Absent cranial vault on ultrasound imaging is characteristic of

Anencephaly. ***Anencephaly*** - **Anencephaly** is a severe neural tube defect resulting in the absence of a major portion of the brain, skull, and scalp - On ultrasound, it presents with **absent cranial vault** (acrania) with no brain tissue visible above the orbits - The **"frog-eye" or "Mickey Mouse" appearance** is pathognomonic due to prominent orbits without overlying cranial structures - This is a **lethal malformation** incompatible with life, typically diagnosed in the first or second trimester *Renal anomalies* - Renal anomalies such as bilateral renal agenesis or multicystic dysplastic kidney can be detected on ultrasound - They present with findings like **absent or abnormal kidney visualization**, **oligohydramnios**, and **"Potter sequence"** - However, they do not cause absent cranial vault; the skull and brain development are typically normal *Congenital rubella syndrome* - **Congenital rubella syndrome** causes various fetal abnormalities including cardiac defects, cataracts, hearing loss, and growth restriction - Ultrasound may show **symmetric IUGR**, cardiac anomalies, or microcephaly - The cranial vault remains intact; this condition does not cause acrania or absent skull bones *Trisomy 18* - **Trisomy 18** (Edwards syndrome) presents with multiple anomalies including **strawberry-shaped skull**, clenched fists, rocker-bottom feet, and cardiac defects - Ultrasound shows **symmetric IUGR** and structural malformations - While the skull shape may be abnormal, the cranial vault is present, unlike in anencephaly

Q: Investigation of choice to diagnose hypertrophic pyloric stenosis in infants is

Ultrasound abdomen. ***Ultrasound abdomen*** - **Abdominal ultrasound** is the diagnostic procedure of choice due to its **non-invasive nature**, **lack of radiation exposure**, and high accuracy in visualizing the pylorus. - It allows for direct measurement of the **pyloric muscle wall thickness** (typically >3-4 mm) and **pyloric channel length** (typically >14-17 mm), which are characteristic findings of hypertrophic pyloric stenosis. *Gastroscopy* - While gastroscopy can visualize the gastric outlet, it is an **invasive procedure** and not the primary diagnostic tool due to the risk associated with endoscopy in infants. - It is often reserved for cases where the diagnosis is unclear or other upper gastrointestinal pathologies are suspected. *CT scan abdomen* - **CT scans** expose infants to **ionizing radiation**, making it an unsuitable primary diagnostic investigation, especially when a highly accurate non-irradiating alternative exists. - Although it can show pyloric thickening, its disadvantages outweigh its benefits for this diagnosis. *Contrast radiology* - **Barium studies** are less sensitive and specific than ultrasound for diagnosing pyloric stenosis, especially for distinguishing muscle thickening from spasm. - This method also involves **radiation exposure** and poses a risk of aspiration, making it a secondary choice.

Q: All are important ultrasound findings of amebic liver abscess, EXCEPT:

Located in the left hepatic lobe. ***Located in the left hepatic lobe*** - While amebic liver abscesses can occur in the left lobe, they are **much more common in the right hepatic lobe** due to the preferential blood flow from the portal vein's superior mesenteric branch. - Therefore, location in the left lobe is not an *expected* or typical finding for an amebic liver abscess. *Round or oval in shape* - **Amebic liver abscesses typically present as round or oval lesions** on ultrasound due to their expanding nature within the liver parenchyma. - This morphology is a common characteristic used for their sonographic identification. *Single lesion* - **Amebic liver abscesses are usually solitary**; multiple abscesses are less common. - This characteristic helps differentiate them from other liver pathologies, such as pyogenic abscesses, which are often multiple. *Hypoechoic with irregular ill defined margins initially* - In their early stages, amebic liver abscesses are **hypoechoic (darker) on ultrasound** because of the initial inflammatory response and presence of necrotic material. - They also tend to have **ill-defined and irregular margins** initially as the infection is spreading through the liver tissue.

Q: The "Target sign" ultrasonographically means:

Intussusception. ***Intussusception*** - The **"target sign"** (also known as the **"donut sign"** or **"pseudokidney sign"**) on ultrasound is a classic finding for **intussusception**. - It represents concentric layers of bowel telescoping into an adjacent segment, creating a central hyperechoic core surrounded by hypoechoic rings. *Liver metastasis* - Liver metastases often appear as **hypoechoic, hyperechoic, or mixed echogenicity lesions** on ultrasound, and vary widely in appearance. - While some can have a "target-like" appearance with a hyperechoic rim, it's not the primary or most specific sign for liver metastasis and is less distinct than in intussusception. *Ectopic kidney* - An ectopic kidney is an anatomical variant where the kidney is located outside its normal position, most commonly in the **pelvis**. - On ultrasound, it would appear as a normally formed kidney in an atypical location, without the distinct concentric layers seen in the "target sign." *Ovarian carcinoma* - Ovarian carcinomas present with **complex masses** that can be solid, cystic, or mixed, often with septations, papillary projections, and areas of necrosis. - Their ultrasound appearance is highly variable but does not typically manifest as a "target sign" with concentric rings.

Q: Thyroid malignancies appear on USG as

Hypoechoic. ***Hypoechoic*** - The majority of **malignant thyroid nodules** appear **hypoechoic** on ultrasound, meaning they reflect fewer sound waves than the surrounding tissues, making them appear darker. - This characteristic often correlates with increased cellularity and decreased colloid content within the tumor. *Hyperechoic* - **Hyperechoic** nodules are brighter than the surrounding parenchyma, which is more commonly associated with **benign conditions** like colloid cysts or hyperplastic nodules, although some rare malignancies can be hyperechoic. - This appearance suggests a higher density of reflections from, for example, colloid or calcifications. *Isoechoic* - **Isoechoic** nodules have similar echogenicity to the adjacent thyroid tissue, making them difficult to distinguish. - While some malignancies can be isoechoic, this feature is more often seen in **benign nodules** or early changes, making it a less specific indicator for malignancy. *Anechoic* - **Anechoic** lesions appear completely black on ultrasound, indicating no internal echoes, which is characteristic of **fluid-filled structures** like simple cysts. - Malignancies are typically solid or predominantly solid and therefore are rarely anechoic.

Q: USG findings of focal anechoic lesion with floating membranes indicate which liver pathology?

Hydatid cyst. ***Hydatid cyst*** - A **hydatid cyst** often presents on ultrasound as a **focal anechoic lesion** with characteristic **floating membranes** (water lily sign) due to detachment of the endocyst. - These cysts are caused by tapeworm larvae (*Echinococcus granulosus*) and can have daughter cysts within the main cyst. *Pyogenic abscess* - A **pyogenic abscess** typically appears as an **ill-defined, hypoechoic liver lesion** with internal debris, sometimes showing gas. - While it can be anechoic, the presence of **floating membranes** is not a characteristic feature. *Hemangioma* - A **hemangioma** is usually a **well-defined, hyperechoic lesion** on ultrasound, without any internal fluid or floating membranes. - Its appearance is distinct from cystic lesions and it often shows characteristic peripheral nodular enhancement on contrast-enhanced imaging. *Amoebic abscess* - An **amoebic abscess** typically presents as a **hypoechoic, often round or oval lesion** with fine internal echoes and poorly defined walls, usually without floating membranes. - It is frequently located in the right lobe of the liver and can be difficult to differentiate from a pyogenic abscess based on imaging alone.

Question 1

POCUS is related to which imaging modality?

Accepted Answer

Ultrasound

Answer

X-ray

Answer

MRI

Answer

CT

Question 2

Pulse echo principle is used by which modality?

Accepted Answer

USG

Answer

X-ray

Answer

CT

Answer

MRI

Question 3

Which of the following contrast agents is used in USG?

Accepted Answer

SonoVue

Answer

Urograffin

Answer

Omnipaque

Answer

Conray

Question 4

Ultrasonography transducer contains –

Accepted Answer

Lead Zirconate

Answer

Sodium fluoride

Answer

Caesium fluoride

Answer

None of the options

Question 5

Absent cranial vault on ultrasound imaging is characteristic of

Accepted Answer

Anencephaly

Answer

Renal anomalies

Answer

Congenital rubella syndrome

Answer

Trisomy 18

Question 6

Investigation of choice to diagnose hypertrophic pyloric stenosis in infants is

Accepted Answer

Ultrasound abdomen

Answer

Gastroscopy

Answer

CT scan abdomen

Answer

Contrast radiology

Question 7

All are important ultrasound findings of amebic liver abscess, EXCEPT:

Accepted Answer

Located in the left hepatic lobe

Answer

Round or oval in shape

Answer

Single lesion

Answer

Hypoechoic with irregular ill defined margins initially

Question 8

The "Target sign" ultrasonographically means:

Accepted Answer

Intussusception

Answer

Liver metastasis

Answer

Ectopic kidney

Answer

Ovarian carcinoma

Question 9

Thyroid malignancies appear on USG as

Accepted Answer

Hypoechoic

Answer

Hyperechoic

Answer

Isoechoic

Answer

Anechoic

Question 10

USG findings of focal anechoic lesion with floating membranes indicate which liver pathology?

Accepted Answer

Hydatid cyst

Answer

Pyogenic abscess

Answer

Hemangioma

Answer

Amoebic abscess

Ultrasound — MCQs

Ultrasound — MCQs

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