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Diagnostic Radiology, CT/MRI & Imaging Modalities (Clinical Super-Specialties & Advanced Surgery) Solved Questions & Notes (2026) - Apex Rankers

Medical & Health Sciences > Clinical Super-Specialties & Advanced Surgery > Diagnostic Radiology, CT/MRI & Imaging Modalities

72 Total Questions
~108 mins Read Time
1 Subject Areas
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Q. 1 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In acute ischemic stroke, the earliest MRI sequence to detect cytotoxic edema is:
A
T1-weighted
B
Gradient echo
C
T2 FLAIR
D
Diffusion-Weighted Imaging (DWI) / ADC map
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
DWI detects restricted Brownian water motion within minutes of arterial occlusion.
Q. 2 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Acute intracranial hemorrhage on a non-contrast brain CT scan appears:
A
Hypodense (Dark black)
B
Iso-dense with CSF
C
Hyperdense (Bright white, 60-80 HU)
✓ Correct
D
Homogeneously cystic
💡 Step-by-Step Explanation & Concept Rationale
Globin protein concentration in fresh extravasated blood attenuates X-rays strongly.
Q. 3 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Which diagnostic imaging modalities emit NO ionizing radiation?
A
Mammography
B
CT scan and X-ray
C
MRI and Ultrasound
✓ Correct
D
Fluoroscopy
💡 Step-by-Step Explanation & Concept Rationale
Ultrasound uses sound waves and MRI uses magnetic radiofrequency; neither uses ionizing radiation.
Q. 4 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
The diagnostic sign of perforated abdominal viscus (pneumoperitoneum) on erect chest X-ray is:
A
Cardiomegaly
B
Atelectasis
C
Free crescentic air under the right hemidiaphragm
✓ Correct
D
Pleural effusion
💡 Step-by-Step Explanation & Concept Rationale
Intraperitoneal gas rises beneath the diaphragm in the upright posture.
Q. 5 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Standard intravenous contrast agent used for MRI enhancement is based on:
A
Air
B
Gadolinium chelates (GBCAs)
✓ Correct
C
Iodine (Iohexol)
D
Barium sulfate
💡 Step-by-Step Explanation & Concept Rationale
Paramagnetic gadolinium shortens T1 relaxation, producing bright signal enhancement.
Q. 6 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In professional practice: In acute ischemic stroke, the earliest MRI sequence to detect cytotoxic edema is:
A
Diffusion-Weighted Imaging (DWI) / ADC map
✓ Correct
B
T1-weighted
C
T2 FLAIR
D
Gradient echo
💡 Step-by-Step Explanation & Concept Rationale
DWI detects restricted Brownian water motion within minutes of arterial occlusion.
Q. 7 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In professional practice: Acute intracranial hemorrhage on a non-contrast brain CT scan appears:
A
Hyperdense (Bright white, 60-80 HU)
✓ Correct
B
Iso-dense with CSF
C
Homogeneously cystic
D
Hypodense (Dark black)
💡 Step-by-Step Explanation & Concept Rationale
Globin protein concentration in fresh extravasated blood attenuates X-rays strongly.
Q. 8 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In professional practice: Which diagnostic imaging modalities emit NO ionizing radiation?
A
MRI and Ultrasound
✓ Correct
B
CT scan and X-ray
C
Mammography
D
Fluoroscopy
💡 Step-by-Step Explanation & Concept Rationale
Ultrasound uses sound waves and MRI uses magnetic radiofrequency; neither uses ionizing radiation.
Q. 9 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In professional practice: The diagnostic sign of perforated abdominal viscus (pneumoperitoneum) on erect chest X-ray is:
A
Atelectasis
B
Pleural effusion
C
Cardiomegaly
D
Free crescentic air under the right hemidiaphragm
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Intraperitoneal gas rises beneath the diaphragm in the upright posture.
Q. 10 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In professional practice: Standard intravenous contrast agent used for MRI enhancement is based on:
A
Gadolinium chelates (GBCAs)
✓ Correct
B
Iodine (Iohexol)
C
Air
D
Barium sulfate
💡 Step-by-Step Explanation & Concept Rationale
Paramagnetic gadolinium shortens T1 relaxation, producing bright signal enhancement.
Q. 11 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
According to standard examination standards: In acute ischemic stroke, the earliest MRI sequence to detect cytotoxic edema is:
A
Gradient echo
B
T1-weighted
C
T2 FLAIR
D
Diffusion-Weighted Imaging (DWI) / ADC map
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
DWI detects restricted Brownian water motion within minutes of arterial occlusion.
Q. 12 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
According to standard examination standards: Acute intracranial hemorrhage on a non-contrast brain CT scan appears:
A
Hyperdense (Bright white, 60-80 HU)
✓ Correct
B
Homogeneously cystic
C
Hypodense (Dark black)
D
Iso-dense with CSF
💡 Step-by-Step Explanation & Concept Rationale
Globin protein concentration in fresh extravasated blood attenuates X-rays strongly.
Q. 13 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
According to standard examination standards: Which diagnostic imaging modalities emit NO ionizing radiation?
A
MRI and Ultrasound
✓ Correct
B
Fluoroscopy
C
Mammography
D
CT scan and X-ray
💡 Step-by-Step Explanation & Concept Rationale
Ultrasound uses sound waves and MRI uses magnetic radiofrequency; neither uses ionizing radiation.
Q. 14 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
According to standard examination standards: The diagnostic sign of perforated abdominal viscus (pneumoperitoneum) on erect chest X-ray is:
A
Pleural effusion
B
Atelectasis
C
Free crescentic air under the right hemidiaphragm
✓ Correct
D
Cardiomegaly
💡 Step-by-Step Explanation & Concept Rationale
Intraperitoneal gas rises beneath the diaphragm in the upright posture.
Q. 15 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
According to standard examination standards: Standard intravenous contrast agent used for MRI enhancement is based on:
A
Gadolinium chelates (GBCAs)
✓ Correct
B
Iodine (Iohexol)
C
Air
D
Barium sulfate
💡 Step-by-Step Explanation & Concept Rationale
Paramagnetic gadolinium shortens T1 relaxation, producing bright signal enhancement.
Q. 16 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
From an applied perspective: In acute ischemic stroke, the earliest MRI sequence to detect cytotoxic edema is:
A
T2 FLAIR
B
Gradient echo
C
T1-weighted
D
Diffusion-Weighted Imaging (DWI) / ADC map
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
DWI detects restricted Brownian water motion within minutes of arterial occlusion.
Q. 17 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
From an applied perspective: Acute intracranial hemorrhage on a non-contrast brain CT scan appears:
A
Iso-dense with CSF
B
Hyperdense (Bright white, 60-80 HU)
✓ Correct
C
Hypodense (Dark black)
D
Homogeneously cystic
💡 Step-by-Step Explanation & Concept Rationale
Globin protein concentration in fresh extravasated blood attenuates X-rays strongly.
Q. 18 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
From an applied perspective: Which diagnostic imaging modalities emit NO ionizing radiation?
A
MRI and Ultrasound
✓ Correct
B
CT scan and X-ray
C
Fluoroscopy
D
Mammography
💡 Step-by-Step Explanation & Concept Rationale
Ultrasound uses sound waves and MRI uses magnetic radiofrequency; neither uses ionizing radiation.
Q. 19 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
From an applied perspective: The diagnostic sign of perforated abdominal viscus (pneumoperitoneum) on erect chest X-ray is:
A
Cardiomegaly
B
Pleural effusion
C
Free crescentic air under the right hemidiaphragm
✓ Correct
D
Atelectasis
💡 Step-by-Step Explanation & Concept Rationale
Intraperitoneal gas rises beneath the diaphragm in the upright posture.
Q. 20 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
From an applied perspective: Standard intravenous contrast agent used for MRI enhancement is based on:
A
Air
B
Gadolinium chelates (GBCAs)
✓ Correct
C
Barium sulfate
D
Iodine (Iohexol)
💡 Step-by-Step Explanation & Concept Rationale
Paramagnetic gadolinium shortens T1 relaxation, producing bright signal enhancement.
Q. 21 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Under standard operational protocols: In acute ischemic stroke, the earliest MRI sequence to detect cytotoxic edema is:
A
Diffusion-Weighted Imaging (DWI) / ADC map
✓ Correct
B
T2 FLAIR
C
Gradient echo
D
T1-weighted
💡 Step-by-Step Explanation & Concept Rationale
DWI detects restricted Brownian water motion within minutes of arterial occlusion.
Q. 22 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Under standard operational protocols: Acute intracranial hemorrhage on a non-contrast brain CT scan appears:
A
Homogeneously cystic
B
Hypodense (Dark black)
C
Iso-dense with CSF
D
Hyperdense (Bright white, 60-80 HU)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Globin protein concentration in fresh extravasated blood attenuates X-rays strongly.
Q. 23 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Under standard operational protocols: Which diagnostic imaging modalities emit NO ionizing radiation?
A
Fluoroscopy
B
CT scan and X-ray
C
MRI and Ultrasound
✓ Correct
D
Mammography
💡 Step-by-Step Explanation & Concept Rationale
Ultrasound uses sound waves and MRI uses magnetic radiofrequency; neither uses ionizing radiation.
Q. 24 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Under standard operational protocols: The diagnostic sign of perforated abdominal viscus (pneumoperitoneum) on erect chest X-ray is:
A
Free crescentic air under the right hemidiaphragm
✓ Correct
B
Atelectasis
C
Pleural effusion
D
Cardiomegaly
💡 Step-by-Step Explanation & Concept Rationale
Intraperitoneal gas rises beneath the diaphragm in the upright posture.
Q. 25 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Under standard operational protocols: Standard intravenous contrast agent used for MRI enhancement is based on:
A
Iodine (Iohexol)
B
Air
C
Gadolinium chelates (GBCAs)
✓ Correct
D
Barium sulfate
💡 Step-by-Step Explanation & Concept Rationale
Paramagnetic gadolinium shortens T1 relaxation, producing bright signal enhancement.
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