-
Notifications
You must be signed in to change notification settings - Fork 4
/
Copy pathphased_dyn_image_parallelCodes.m
166 lines (120 loc) · 4.73 KB
/
phased_dyn_image_parallelCodes.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
%PHASED_DYN_IMAGE Create a phased-array B-mode image, using the
% commands for setting a dynamic focusing
%VERSION 1.0, 29 Feb 2000, Svetoslav Nikolov
path('/home/tjh/git/zemp_lab/Matlab/bft',path);
path('/home/tjh/git/fieldII',path);
f0 = 5e6; % Central frequency [Hz]
fs = 20e6; % Sampling frequency [Hz]
c = 1540; % Speed of sound [m/s]
B = .6; % Relative bandwith [fraction]
no_elements = 128; % Number of elements in the transducer
lambda = c / f0; % Wavelength [m]
pitch = lambda / 2; % Pitch - center-to-center [m]
width = .95*pitch; % Width of the element [m]
kerf = pitch - width; % Inter-element spacing [m]
height = 10/1000; % Size in the Y direction [m]
% Define the impulse response of the transducer
impulse_response = sin(2*pi*f0*(0:1/fs:2/f0));
impulse_response = impulse_response.*hanning(length(impulse_response))';
excitation = impulse_response;
% Define the phantom
pht_pos = [0 0 20;
0 0 30;
0 0 40;
0 0 50;
0 0 60;
0 0 70;
0 0 80;] / 1000; % The position of the phantom
pht_amp = 20*ones(7,1); % The amplitude of the back-scatter
% Define the focus
focus_r = [20;30;40;50;60;70;80;90] / 1000;
T = (focus_r-5/1000)/c *2;
% Initialize the program
field_init(0);
bft_init;
% Set some paramters
set_field('c', c);
bft_param('c', c);
set_field('fs', fs);
bft_param('fs', fs);
% Create some apertures.
xmt = xdc_linear_array(no_elements,width,height,kerf,1,1,[0 0 0]);
rcv = xdc_linear_array(no_elements,width,height,kerf,1,1,[0 0 0]);
xdc = bft_linear_array(no_elements, width, kerf);
% Set the impulse responses
xdc_impulse(rcv, impulse_response);
xdc_impulse(xmt, impulse_response);
xdc_excitation(xmt, excitation);
% Set the apodization
xdc_apodization(xmt, 0, ones(1,no_elements))
xdc_apodization(rcv, 0, ones(1,no_elements))
bft_apodization(xdc, 0 , ones(1,no_elements))
% Define and create the image
sector = 30 * pi / 180;
no_lines = 256;
d_theta = sector / (no_lines-1);
theta = -(no_lines-1) / 2 * d_theta;
Rmax = max(sqrt(pht_pos(:,1).^2 + pht_pos(:,2).^2 + pht_pos(:,3).^2)) + 15/1000;
no_rf_samples = ceil(2*Rmax/c * fs);
rf_line = zeros(no_rf_samples, 1);
bf_line = zeros(no_rf_samples, 1);
env_line = zeros(no_rf_samples, no_lines);
env_bf = zeros(no_rf_samples, no_lines);
xmt_r = (max(focus_r) + min(focus_r) )/2;
bf = cell(no_lines,1);
for i = 1 : no_lines
rf_line(:) = 0;
theta;
xmt_f = [sin(theta)*xmt_r, zeros(length(xmt_r),1), cos(theta)*xmt_r];
xdc_center_focus(xmt,[0 0 0])
xdc_center_focus(rcv,[0 0 0])
bft_center_focus([0 0 0]);
xdc_focus(xmt, 0, xmt_f);
xdc_dynamic_focus(rcv, 0, theta, 0);
% Beamform with Field II
[rf_temp, t(i)] = calc_scat(xmt,rcv, pht_pos, pht_amp);
% Beamform with BFT
bft_dynamic_focus(xdc, theta, 0)
xdc_focus_times(rcv, 0, zeros(1,no_elements));
[rf_data, start_t] = calc_scat_multi(xmt,rcv, pht_pos, pht_amp);
rf_data = [zeros(300,no_elements); rf_data; zeros(300,no_elements)];
start_t = start_t - 300 / fs;
bf_temp = bft_beamform(start_t, rf_data);
start_sample = t(i)*fs; no_temp_samples = length(rf_temp);
rf_line(start_sample:start_sample+no_temp_samples-1) = rf_temp(1:no_temp_samples);
env_line(:,i) = abs(hilbert(rf_line(:)));
start_sample = floor(start_t*fs); no_temp_samples = length(bf_temp);
bf{i} = bf_temp;
bf_line(start_sample:start_sample+no_temp_samples-1) = bf_temp(1:no_temp_samples);
env_bf(:,i) = abs(hilbert(bf_line(:)));
theta = theta + d_theta;
end
% Release the allocated memory
field_end
bft_end
env_line = env_line / max(max(abs(env_line)));
env_bf = env_bf / max(max(abs(env_bf)));
figure;
subplot(1,2,1)
imagesc([-sector/2 sector/2]*180/pi,[0 Rmax]*1000,20*log10(env_line + 0.001))
axis('image')
xlabel('Angle [deg]');
ylabel('Axial distance [mm]')
title('Beamformed by Field II ');
subplot(1,2,2)
imagesc([-sector/2 sector/2]*180/pi,[0 Rmax]*1000,20*log10(env_bf + 0.001));
title('Beamformed by BFT');
xlabel('Angle [deg]');
ylabel('Axial distance [mm]')
axis('image')
colorbar
colormap(gray)
%clc
disp([' ' 10 10 10 10 ]);
disp([9 '*****************************************************']);
disp([9 '* *']);
disp([9 '* The image beamformed by Field II is in "env_line" *']);
disp([9 '* The image beamformed by BFT is in "env_bf" *']);
disp([9 '* *'])
disp([9 '*****************************************************']);
disp([' ' 10 10 ]);