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neet pg > Radiology > Flashcards

Radiology Flashcards

1
Q

Recovery of taste loss after radiotherapy occurs after

A

60-120 days

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2
Q

This force carrier particle mediate strong nuclear force that binds quarks into proton and neutrons and bind nuclie together

A

Gluons

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3
Q

Javelle water is

A

Sodium hypochlorite also known as daikin solution

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4
Q

Effective dose of panoramic radiographs

A

9-26 micron Sv

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5
Q

Photoelectric interaction in bone is ____ times greater than an equal thickness of soft tissue

A

6.5

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6
Q

Onset of radiation induced leukaemia is after

A

2-3years

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7
Q

Bystander effect is

A

When tissue other that focused area is affected

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8
Q

Atelectasis

A

Collapse of pulmonary alveoli

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9
Q

Twinning effect is seen in

A

NiTi

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10
Q

Useful range of density for a dental X-ray is

A

0.3-2

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11
Q

The beta particle emitted by a radioactive nuclie can penetrate the tissue to a maximum depth of

A

1.5cm

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12
Q

Calcifying plaque becomes 50% mineralised in

A

Two days

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13
Q

Piezo surgery was invented by

A

Vercellotti

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14
Q

Brachytherapy

A

Treatment of carcinomas with radiation by inserting internal implants in the body

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15
Q

Technique employed in radiotherapy to counteract the effect of Tumour motion due to breathing is known as

A

Gating

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16
Q

In a freshly made bleaching powder the available chlorine is

A

33%

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17
Q

Bupivacain used in concentration of

A

0.5%

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18
Q

In radiology, DNA damage cluster is defined as

A

Two or more double strands break within two turns of DNA

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19
Q

Trench ramp area are methods of

A

Controlled tipping

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20
Q

Mild hematopoetic symptoms in acute radiation syndrome is observed at dose

A

2-7 Gy

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21
Q

Multisensory communication helps these children the best

A

7-10yrs

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22
Q

Prompt somatic effects of radiation

A

Hair loss that occurs about 3 weeks after a dose of 400 rad to scalp

23
Q

Inflammation of mucous membranes occurs

A

2 weeks of radiotherapy heals in 2 months after treatment has stopped

24
Q

When teeth are to be removed after radiotherapy

A

Low concentration epinephrine containing local anaesthetic that do not contain lidocaine are used

25
Q

Injury to GIT

A

7-15 Gy

700-1500 rads

26
Q

CNS CVS symptoms

A

50Gy and over

27
Q

Salivary flow reaches zero at

A

60 Gy

28
Q

Deterministic and stochastic

A 
Deterministic = mucositis
Stochastic = mutagenesis, carcinogenesis, teratogenesis
29
Q

Radiation induced carriers can occurs is

A

3 months

30
Q

Mean exposure of skin from IOPA is

A

300mR

From OPG it’s 90mR

31
Q

Occupational dose limit relative to deterministic effect to
1 lens of the eye
2 skin

A

1 150 micro Sv/year

2. 500 micro sievert/ year

32
Q

Exposure for an IOPA with rectangular collimation, panoramic radiograph, circular collimation, CBCT, CT

A 
Rectangular collimation 5 micro Sv
Round collimation 171 micro Sv 
Panoramic 9-26
Cephalogram 3-6
CBCT 20-600
CT of head 860-2000
33
Q

Processing solution is checked using

A

Reference radiograph or
STEP WEDGE PHANTOM
OR normalising solution

34
Q

To differentiate margins of cyst from the surface of cortex

A

Low radiograph density

35
Q

F speed is faster because

A

Presence of tubular crystal grains used in F speed

36
Q

Film is off greatest diagnostic value when structure of interest has

A

0.6-3 optical density units

37
Q

Minimum density is called gross fog or base plus fog

A

Optical density is 0.2-0.3

38
Q

Angulation in bitewing radiograph

A

+7 to +10 vertical angulation

39
Q

Best view for zygomatic arches

A

Submentovertex

40
Q

Water’s view visualises

A

Fractures of middle third and maxillary sinus also demonstrates chronic process

41
Q

For visualising condylar neck or sub condylar fractures

A

Reverse town and transorbital view

42
Q

Submento vertex view demostrates

A

Base of the skull, curvature of mandible, position and orientation of condyles, and zygomatic arch fractures

For zygomatic arch fracture exposure time is reduced to 1/3 of that is used for skull visualisation

43
Q

Zygoma fractures are best seen with

A

Water view

44
Q

Best for detecting perforation in the disk

A

Anthrography

45
Q

Radiopaque contrast in sialogram

A

Ethidiol ( lipid soluble)

Sianografin (non lipid soluble)

46
Q

Dye in scintiscan

A

Tc pertechnatate is given iv

Contraindicated in acute inflammatory conditions

47
Q

Principles of panoramic radiography was given by

A

Patero and numata

48
Q

Angulation for anterior mandibular occlusal projection

A

-10 degrees from chin

49
Q

Anterior maxillary occlusal projection

A

+45 through tip of the nose

50
Q

Articular disk using MRI using T1 and T2

A

T1 or proton weighted images best demonstrate osseous and diskal tissues
T2 weighted images demonstrate inflammation and temporomandibular joint

MRI can detect accumulation of fluid in joint spaces which appears as high signal in the joint spaces in T2 images

51
Q

In fluoroscopy contrast material contains

A

Iodine

52
Q

Bimolar technique or gardener technique

A

Lateral oblique view of right and left half of jaw

53
Q

Best suited for detecting calculus in submandibular gland

A

Mandibular true occlusal

neet pg (5 decks)

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