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Evaluation of tissue mimicking quality of tofu for biomedical ultrasound.char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = s;code = 115 char = u;code = 117 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = c;code = 99 char = k;code = 107 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = q;code = 113 char = u;code = 117 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = f;code = 102 char = u;code = 117 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = e;code = 101 char = 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= e;code = 101 char = ;code = 32 char = r;code = 114 char = i;code = 105 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = f;code = 102 char = u;code = 117 char = ;code = 32 char = d;code = 100 char = u;code = 117 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = u;code = 117 char = l;code = 108 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = s;code = 115 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = b;code = 98 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = p;code = 112 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = d;code = 100 char = u;code = 117 char = c;code = 99 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = t;code = 116 char = o;code = 111 char = /;code = 47 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = r;code = 114 char = m;code = 109 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = s;code = 115 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = f;code = 102 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = u;code = 117 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = /;code = 47 char = d;code = 100 char = i;code = 105 char = f;code = 102 char = f;code = 102 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = s;code = 115 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = i;code = 105 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = e;code = 101 char = m;code = 109 char = b;code = 98 char = e;code = 101 char = d;code = 100 char = d;code = 100 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = r;code = 114 char = m;code = 109 char = o;code = 111 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = g;code = 103 char = r;code = 114 char = e;code = 101 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = p;code = 112 char = o;code = 111 char = n;code = 110 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = u;code = 117 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = /;code = 47 char = d;code = 100 char = i;code = 105 char = f;code = 102 char = f;code = 102 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = s;code = 115 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = h;code = 104 char = e;code = 101 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = p;code = 112 char = a;code = 97 char = c;code = 99 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = f;code = 102 char = u;code = 117 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = 0;code = 48 char = .;code = 46 char = 7;code = 55 char = 6;code = 54 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = /;code = 47 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = g;code = 103 char = r;code = 114 char = e;code = 101 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = C;code = 67 char = ;code = 32 char = (;code = 40 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = i;code = 105 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = 3;code = 51 char = .;code = 46 char = 1;code = 49 char = 8;code = 56 char = ;code = 32 char = J;code = 74 char = /;code = 47 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = g;code = 103 char = r;code = 114 char = e;code = 101 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = C;code = 67 char = );code = 41 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = i;code = 105 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = b;code = 98 char = o;code = 111 char = u;code = 117 char = t;code = 116 char = ;code = 32 char = 7;code = 55 char = 6;code = 54 char = %;code = 37 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = n;code = 110 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = a;code = 97 char = r;code = 114 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = u;code = 117 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = f;code = 102 char = u;code = 117 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = (;code = 40 char = 1;code = 49 char = .;code = 46 char = 3;code = 51 char = );code = 41 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = s;code = 115 char = c;code = 99 char = r;code = 114 char = i;code = 105 char = b;code = 98 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = i;code = 105 char = s;code = 115 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = u;code = 117 char = l;code = 108 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = g;code = 103 char = g;code = 103 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = f;code = 102 char = u;code = 117 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = l;code = 108 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = ;code = 32 char = M;code = 77 char = H;code = 72 char = z;code = 122 char = ;code = 32 char = r;code = 114 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = v;code = 118 char = i;code = 105 char = e;code = 101 char = w;code = 119 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = i;code = 105 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = d;code = 100 char = u;code = 117 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = n;code = 110 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = a;code = 97 char = r;code = 114 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = p;code = 112 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = u;code = 117 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 result sql = The tissue mimicking quality of tofu has been evaluated in terms of acoustic properties and acousto/thermal conversion as functions of frequency and diffraction corrected intensity over the 2 MHz to 18 MHz range using three unfocussed transducers with center frequencies of 5 MHz, 10 MHz and 15 MHz. The density and acoustic velocity were close to the American Institute of Ultrasound in Medicine (AIUM) recommended values for the soft tissue, however, the attenuation increases nonlinearly with frequency as alpha = 0.56 x f(1.3). As a result, the temperature rise in tofu due to ultrasound absorption is expressed by the product of the acousto/thermal conversion factor and the attenuation/diffraction corrected acoustic intensity. The decrease of temperature rise with depth measured by embedded thermocouples agrees with the theoretical exponential decrease of the attenuation/diffraction corrected acoustic intensity. The heat capacity per unit mass of tofu is 0.76 cal/g degrees C (equivalent to 3.18 J/g degrees C) of which about 76% is water. The nonlinear frequency dependence of attenuation in tofu as f(1.3) correctly describes the frequency dependence of temperature rise. The present results suggest that tofu may only be used in a limited low MHz range in view of the estimation of temperature rise and penetration depth due to nonlinear frequency dependence of attenuation.
Publication: Ultrasound Med Biol 2009 Mar ;35(3)::472-81. :doi: 10.1016/j.ultrasmedbio.2008.09.005.
Publication Date: 2009 Mar
Study Author(s): Kim, Yong Tae;Kim, Ho Chul;Inada-Kim, Matthew;Jung, Sung Soo;Yun, Yong Hyeon;Jho, Moon Jae;Sandstrom, Kurt;
Institution: Division of Physical Metrology, Korea Research Institute of Standards and Science, Yusong, Daejeon, Republic of Korea.
[email protected]
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The tissue mimicking quality of tofu has been evaluated in terms of acoustic properties and acousto/thermal conversion as functions of frequency and diffraction corrected intensity over the 2 MHz to 18 MHz range using three unfocussed transducers with center frequencies of 5 MHz, 10 MHz and 15 MHz. The density and acoustic velocity were close to the American Institute of Ultrasound in Medicine (AIUM) recommended values for the soft tissue, however, the attenuation increases nonlinearly with frequency as alpha = 0.56 x f(1.3). As a result, the temperature rise in tofu due to ultrasound absorption is expressed by the product of the acousto/thermal conversion factor and the attenuation/diffraction corrected acoustic intensity. The decrease of temperature rise with depth measured by embedded thermocouples agrees with the theoretical exponential decrease of the attenuation/diffraction corrected acoustic intensity. The heat capacity per unit mass of tofu is 0.76 cal/g degrees C (equivalent to 3.18 J/g degrees C) of which about 76% is water. The nonlinear frequency dependence of attenuation in tofu as f(1.3) correctly describes the frequency dependence of temperature rise. The present results suggest that tofu may only be used in a limited low MHz range in view of the estimation of temperature rise and penetration depth due to nonlinear frequency dependence of attenuation.