General Radiology - 4 - Free MCQ Practice Test with solutions, NEET PG

In cases of congenital uterine anomalies, the most effective imaging technique for investigation is:

• MRI (Magnetic Resonance Imaging) provides detailed images of the uterus and surrounding structures.
• CT (Computed Tomography) is less commonly used due to radiation exposure.
• HSG (Hysterosalpingography) is useful for assessing the uterine cavity but offers limited information on structural anomalies.
• Hysteroscopy allows direct visualisation of the uterine cavity, making it valuable for diagnosis and treatment.

Among these options, MRI is preferred for its clarity and safety in evaluating congenital uterine anomalies.

The best method to investigate pericardial effusion is through:

• Echocardiography: This test uses sound waves to create images of the heart and is very effective in detecting fluid around the heart.
• Other methods like CT and MRI can also be used, but they are not as commonly employed for this specific condition.
• X-ray is less effective for diagnosing pericardial effusion, as it may not clearly show the fluid.

In summary, echocardiography is the preferred choice for its accuracy and ease of use.

A barium swallow is a medical test used to examine the swallowing process and the structure of the oesophagus. During this test, a patient drinks a liquid containing barium, which coats the lining of the oesophagus. This allows for clearer images during X-rays.

• The primary purpose is to identify issues such as reflux, blockages, or abnormal growths.
• It helps in diagnosing conditions affecting the oesophagus like strictures or tumours.
• While it is not used for examining the colon, duodenum, or jejunum, it specifically focuses on the oesophagus.

This test is crucial for understanding swallowing difficulties and providing appropriate treatment.

The optic foramen is an important opening in the skull. It allows the passage of crucial structures from the brain to the eye. Here are some key points about the optic foramen:

• It is located at the back of the eye socket.
• The optic nerve and the ophthalmic artery pass through this foramen.
• It is essential for vision as it connects the brain to the eye.

Understanding the optic foramen is vital in anatomy and helps in comprehending how the visual system functions.

The unit Becquerel measures the rate of radioactive disintegration per second. It indicates how many atoms of a radioactive substance decay in one second. The value of one Becquerel is equivalent to one disintegration per second.

In this context, we need to identify the equivalent of Becquerel in terms of disintegrations per second. The values provided in the options indicate different magnitudes of disintegration rates.

• A Becquerel is equal to 3.7 × 10¹⁰ disintegrations per second.
• Alternatively, it could be 2.7 × 10¹⁰, which represents a different quantity.
• Another option suggests it is 1.7 × 10¹⁰ disintegrations per second.
• There is also a possibility of it being 3.7 × 10^-2, indicating a much smaller rate.
• Lastly, it could simply be 1, which represents a minimal disintegration rate.

For clarity, the most widely accepted value for 1 Becquerel is 1 disintegration per second, which is confirmed as the standard definition of the unit.

The term ionization potential refers to the energy required to remove an electron from an atom or ion. In this context, we need to evaluate the ionization potential of different particles.

• Electron: It has a negative charge and is relatively easy to remove from an atom, resulting in a low ionization potential.
• Proton: As a positively charged particle, it is usually found in the nucleus of an atom and does not have a defined ionization potential in the same way as electrons.
• Helium ion: A helium ion (He⁺) is formed when a helium atom loses one electron. This ionization potential is higher than that of a neutral atom due to the effective nuclear charge.
• Gamma-Photon: Gamma photons are packets of electromagnetic radiation and do not possess an ionization potential in the traditional sense, as they are not particles that can be ionized.

Among these options, the Helium ion has the maximum ionization potential due to its stable configuration and the strong attraction between the remaining electron and the nucleus.

The technique that uses the piezo-electric effect is ultrasonography. This method relies on the ability of certain materials to generate an electric charge when subjected to mechanical stress. Here’s a brief overview:

• Ultrasonography employs sound waves to create images of internal body structures.
• The piezo-electric effect is crucial for the operation of the ultrasound transducer, which converts electrical signals into sound waves and vice versa.
• This technique is widely used in medical imaging due to its safety, as it does not involve ionising radiation.

When investigating choledocholithiasis, the best imaging technique is:

• MRCP (Magnetic Resonance Cholangiopancreatography) is the preferred method.
• It provides detailed images of the bile ducts, helping to identify stones effectively.
• Other options like CT and USG may also be used, but MRCP is more specific for this condition.

The best method for investigating deep vein thrombosis (DVT) is:

• Doppler ultrasound (USG) - This test uses sound waves to create images of blood flow in the veins, helping to detect clots.
• Angiography - This is a more invasive procedure that uses contrast dye and X-rays to view blood vessels.
• CT scan - This imaging technique provides detailed pictures of the body's internal structures, but is not the first choice for DVT.
• MRI - Although useful for visualising soft tissues, it is generally not preferred for diagnosing DVT.

In summary, Doppler ultrasound is the most effective and non-invasive choice for diagnosing DVT.

In this situation, immediate action is required due to the child's symptoms after receiving contrast injection. The swelling and subsequent numbness indicate a potential complication. Here’s what should be done:

• Immediate fasciotomy: This is necessary to relieve pressure caused by swelling, which can lead to serious complications if not addressed promptly.
• Monitoring the child's pulse is important, but the presence of pulse alone does not rule out the need for surgical intervention.
• Other options, such as prednisolone or angiography, may not address the urgent need to relieve pressure effectively.

Therefore, performing a fasciotomy is the best course of action to prevent further damage.

The radionuclide scan used for detecting parathyroid adenoma is known as Sestamibi.

Here are the key points:

• Sestamibi is a type of scan that specifically targets parathyroid tissue.
• It helps in identifying abnormal growths, such as adenomas.
• Other scans like Iodine-123, 99m-Tc-sulphurcolloid, and Gallium are not typically used for this purpose.

Using a water-soluble contrast medium is important in medical imaging, particularly in assessing the gastrointestinal tract. Here are key points to consider:

• Constipation: Water-soluble contrast can help identify blockages.
• Perforation: This condition may require immediate imaging to confirm any holes in the gastrointestinal tract.
• Ileocecal tuberculosis: The contrast can assist in diagnosing infections in this area.
• Gastroesophageal reflux: While not the primary use, it can provide insights into esophageal conditions.

In summary, the use of water-soluble contrast media is crucial in diagnosing various gastrointestinal issues, especially perforation.

When looking at liver metastasis on ultrasound, one specific type appears as a hypoechoic lesion. This means it looks darker compared to the surrounding liver tissue. The type of cancer that is commonly associated with this appearance is:

• Colon cancer
• Breast cancer typically appears as a hyperechoic lesion.
• Renal cancer can show various patterns depending on the case.
• Mucinous adenocarcinoma may have different echogenic characteristics.

Thus, in ultrasound imaging, the key characteristic of colon cancer metastasis is its hypoechoic nature.

An X-ray artifact refers to any unwanted feature that appears in an X-ray image, which can distort the actual view of the area being examined. Here are some key points about X-ray artifacts:

• A radiolucent area is a dark spot on the X-ray that may not represent real tissue.
• Any abnormal opacity appears as a white area, indicating something unusual in the image.
• Artifacts can also be produced when a patient moves during the X-ray process, leading to blurriness.

In summary, X-ray artifacts can be any of the above factors, affecting the clarity and accuracy of the images.

The decubitus view is particularly helpful for identifying:

• Pleural effusion with fluid accumulation that can affect breathing.
• Pleural effusion in the dependent hemithorax, where fluid settles in the lower part of the chest.
• Fluid around the heart, known as pericardial effusion.
• Consolidation in the middle lobe of the lung, which can indicate infection or inflammation.

Among these, the most significant observation in the decubitus view is related to the second point.

X-rays were first discovered in 1895 by Wilhelm Conrad Roentgen. He found that when electric currents passed through a vacuum tube, invisible rays were emitted that could penetrate various materials.

Roentgen's discovery was significant as it allowed doctors to see inside the human body without surgery, revolutionising medical diagnostics.

To summarise:

• X-rays were discovered by Roentgen.
• His findings changed medical practices.
• They enable non-invasive examination of patients.

A grid is a tool used primarily for:

• Minimising scattered radiation, which helps in achieving clearer images.
• Decreasing the time patients are exposed to radiation.
• Improving the contrast in X-ray images, making them easier to interpret.

In summary, the grid plays a crucial role in enhancing the quality of radiographic images while ensuring patient safety.

The active ingredient used in X-ray film is primarily silver bromide. This compound is sensitive to light, which allows it to capture images when exposed to X-rays. Here are some key points about it:

• Silver bromide is a light-sensitive material.
• It forms the basis of the emulsion layer on X-ray films.
• When exposed to X-rays, it undergoes a chemical change to create an image.

This property makes silver bromide ideal for medical imaging applications.

To identify minimal pleural effusion on an X-ray, the best view is the lateral decubitus position. This view allows for better visualization of small amounts of fluid by showing it as a layer along the lateral side of the thorax. In this position, gravity helps to separate the fluid from the lung, making it easier to detect. Other views, such as AP, PA, and lateral, are less effective for this purpose.

The half-life of Technetium-99 (Tc-99) is approximately 6 hours. This means that after this time, half of the original amount of Tc-99 will have decayed into other elements. Here are a few key points to understand about half-life:

• The half-life is the time required for half of a radioactive substance to decay.
• In the case of Tc-99, it decays relatively quickly compared to other isotopes.
• This short half-life makes Tc-99 useful in medical imaging and treatments.

To detect interlobar pleural effusion effectively, the best positioning is:

• Lateral decubitus position, where the patient lies on their side, allows for better visibility of fluid in the pleural space.
• This position helps differentiate between types of effusions and provides clearer images.

Piezoelectric crystals are primarily used in ultrasound (US) technology. This modality is considered safe as it does not involve any form of radiation. In contrast, other imaging techniques like CT scans and MRI may use radiation or magnetic fields. Thus, ultrasound is the preferred option for those seeking a radiation-free imaging method.

The radioisotope commonly used in a PET scan is Fluoride 18. This isotope is preferred because it emits positrons, which are essential for creating detailed images of the body's internal structures.

The most common radiological feature of sarcoidosis in Indian patients is:

• Bilateral hilar lymphadenopathy: This is the enlargement of lymph nodes located in the region where the lungs meet the trachea.
• It is often seen in chest X-rays of patients with sarcoidosis.
• Other features may include parenchymal infiltrates, but bilateral hilar lymphadenopathy is the key identifying characteristic.

The most effective imaging test for detecting extra-adrenal pheochromocytoma is the MIBG scan. This test is specifically designed to identify neuroendocrine tumours, such as pheochromocytomas, which can occur outside the adrenal glands.

Here are some key points regarding the MIBG scan:

• MIBG stands for meta-iodobenzylguanidine, a compound that is taken up by certain types of tumours.
• The scan uses a small amount of radioactive material to highlight areas of concern in the body.
• It is particularly sensitive for identifying tumours that may not be visible on other imaging tests like CT or MRI.

In summary, for evaluating extra-adrenal pheochromocytoma, the MIBG scan is the preferred choice due to its high sensitivity in detecting these specific tumours.