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ASMIRT CT Exam > CT Technique > Flashcards

CT Technique Flashcards

1
Q

What reconstruction thickness and interval would you use for CT Brain bone reconstruction?

A

0.6/0/4

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2
Q

What reconstruction thickness and interval would you use for CT Brain cerebrum reconstruction?

A

0.75/0.6

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3
Q

What reconstruction thickness and interval would you use for a CT chest, neck or abdomen/pelvis?

A

1.0/0.8

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4
Q

What reconstruction thickness and interval would you use for CT cervical spine?

A

0.6/0.4

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5
Q

What reconstruction thickness and interval would you use for PTB or inner ear?

A

0.5/0.3

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6
Q

What reconstruction thickness and interval would you use for wrist or elbow?

A

0.6/0.4

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7
Q

What reconstruction thickness and interval would you use for CT COW, Carotid angio or neuroperfusion?

A

0.5/0.3

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8
Q

What reconstruction thickness and interval would you use for CT calcium score?

A

1.0/1.0

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9
Q

What reconstruction thickness and interval would you use for renal angio or leg run off?

A

0.75/0.6

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10
Q

What are the indications of cardiac CT?

A

CAD, chest pain, family history, SOBOE, chest tightness, increased troponin, irregular ECG

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11
Q

What is the patient preparation for cardiac CT?

A

Fasted 4 hours, no tea/coffee morning of appointment, BP and heart rate observations, list all medications, GTN (unless viagra or cialis in 48 hoursor BP below 105 systolic)

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12
Q

What is prospective gating?

A

Monitoring RR intervals either previous 3 (mean) or 5 (median) and exposing only at selected range

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13
Q

What is retrospective gating?

A

Retrospectively selecting data to be included in reconstructed range, beam is always on and pitch must be appropriate for heart rate

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14
Q

Which scanning mode results in higher radiation dose?

A

Retrospective

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15
Q

When is helical scanning useful?

A

Uncooperative patients, irregular heart rates

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16
Q

When is sequential scanning useful?

A

Younger patients (where radiation dose is a concern), regular heart rates,, cooperative patients, calcium deposits

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17
Q

What are the indications of CT calcium score?

A

Family history, hypercalcaemia

18
Q

What are the indications of a CT colonoscopy?

A

Unsuitable for anaesthetics, failed colonoscopy, iron deficient anaemia, positive FOBT

19
Q

What are the benefits of CT colonoscopy?

A

Less invasive, extracolonic findings, highly sensitive and specific

20
Q

What is the role of CT perfusion?

A

Differentiate salvagable ischaemic brain tissue (penumbra) from the damaged infarcted brain (infarct core)

21
Q

Which groups can result in overestimated MTT and underestimated CBF?

A

Poor cardiac output, AF, arterial stenosis

22
Q

What are the indications for CT neuroperfusion?

A

Acute infarction,
Assessment of reperfusion after treatment of acute stroke
New neurological symptoms after subarachnoid haemorrhage
Evaluation of haemodynamic significance of carotid stenosis
Transient ischaemic attack
Significant head trauma
Brain tumor

23
Q

What is mean transit time?

A

Average time in seconds that red blood cells spend within a determinate volume of capillary circulation

24
Q

How is mean transit time calculated?

A

MTT=CBV/CBF

25
Q

What is is time to peak?

A

Time at which contrast concentration reaches its maximum

26
Q

What is cerebral blood volume?

A

Volume of blood in a given amount of brain tissue in mL of blood per 100g brain tissue

27
Q

What is cerebral blood flow?

A

Volume of blood passing through a given amount of brain tissue per unit of time in mL of blood per minute per 100g of brain tissue

28
Q

What are the features of an infarct core?

A

Increased MTT
Markedly decreased CBF
Markedly decreased CBV

29
Q

What are the features of penumbra?

A

Increased MTT
Moderately reduced CB
Normal or increased CBV

30
Q

What scans are performed for CT neuroperfusion and why?

A 
CT brain (rule out haemorrhagic stroke)
CT perfusion (determine salvagable brain tissue)
CT carotid angio (provide clot location and mapping for thrombolysis or retrieval)
31
Q

What is the normal MTT for grey matter?

A

4sec

32
Q

What is the normal MTT for white matter?

A

4.8sec

33
Q

What is the normal CBF for grey matter?

A

60mL/100g/min

34
Q

What is the normal CBF for white matter?

A

25mL/100g/min

35
Q

What is the normal CBV for grey matter?

A

4mL/100g

36
Q

What is the normal CBV for white matter?

A

2mL/100g

37
Q

What is an approximate window width and level for brain?

A

80/40

38
Q

What is an approximate window width and level for soft tissue?

A

400/50

39
Q

What is an approximate window width and level for lung?

A

1500/-500

40
Q

What is an approximate window width and level for bone?

A

1500/500

41
Q

What is an approximate window width and level for spine?

A

250/50

ASMIRT CT Exam (5 decks)

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