Elevational Resolution & Temporal Resolution

• Slice thickness also called —-, also known as —-

Elevational plane, partial volume thickness

Is elevational plane razor thin?

No

Slice thickness is focused with , focal zone — be moved

A mechanical lens, cannot

1D Array

Elevational plane focused mechanically with a lens - FIXED FOCUS IN ELEVATIONAL PLANE 

1.5D Array

Elevational plane is focused electronically reducing chance of slice-thickness artifact

2D Array

NO RELATION to ELEVATIONAL RESOLUTION, but is a type of real time 3D probe

3 factors that affect frame rate

PRF, number of focal zones, number of scan lines per frame 

the higher the PRF, the — the frame rate 

better 

depth and PRF are — related

inversely

increasing the depth — the frame rate

decreases

if we double the focal zone then the frame rate is — 

halved

if we triple the focal zone, the frame rate is decreased by —

1/3

why do multiple focal zones hurt the frame rate?

decreases temporal resolution

number of lines per frame can refer to — and —

line density, sector/image width

if we make the image width wider then we — the frame rate

decrease

equation for frame rate

FR = PRF/LPF

frame rate is — related to PRF

directly

if we decrease depth, PRF —

increases

frame rate is — related to LPF (lines per frame) 

inversely 

if we decrease the sector width then the frame rate —

increases

another way to improve FR without touching image width

line density button (lower)

the more scan lines that make up the image, the better the — of the image

spatial resolution

the more scan lines the worse the —

temporal resolution

If the frame rate stays the same but the depth was increased, what must’ve happened?

lines per frame (sector image) must’ve decreased 

• What happened to the PRP if the frame rate increased but the lines per frame stays the same?

PRP decreased

Need a faster frame rate but you can’t adjust the depth, what can you change? 

decrease sector width (LPF) or get rid of focal zones if there are multiple