Compositions and methods for imaging a cell

1 . A method comprising:

a. applying a first alternating electric field at a first frequency of 25 kHz to 1 MHz to a cancer cell for a first period of time, wherein application of the first alternating electric field at the first frequency to the cancer cell for the first period of time increases permeability of cell membranes of the cancer cell;

b. introducing a conductive nanoparticle to the cancer cell, wherein the increased permeability of the cell membranes enables the conductive nanoparticle to cross the cell membrane;

c. imaging the cancer cell; and

d. applying a second alternating electric field at a second frequency to the cancer cell for a second period of time, wherein the second frequency is different from the first frequency, and wherein the second alternating electric field at the second frequency reduces viability of the cancer cell.

2 . The method of claim 1 , wherein the first alternating electric field at the first frequency is removed prior to imaging the cancer cell.

3 . The method of claim 1 wherein the conductive nanoparticles are decorated with Gd3+, decorated with gadolinium-based contrast agent, or decorated with radioisotopes.

4 . The method of claim 1 , wherein the impedance in the cancer cell is lowered.

5 . The method of claim 1 , wherein the conductivity in the cancer cell is increased.

6 . The method of claim 1 , wherein the second alternating electric field is a tumor-treating field.

7 . The method of claim 1 , wherein the cancer cell is a glioblastoma cell, a uterine sarcoma cell, a breast adenocarcinoma cell, a pancreatic cancer cell, a non-small cell lung cancer cell, a hepatocellular cancer cell, a gastric cancer cell, or a brain cancer cell.

8 . The method of claim 1 , wherein the imaging is carried out using magnetic resonance imaging (MRI), computed tomography (CT), Optical imaging, X-ray, positron emission tomography (PET), PET-CT, single-photon emission computed tomography (SPECT), SPECT/CT, or positron emission mammography (PEM).

9 . The method of claim 1 , wherein applying a first alternating electric field at a first frequency to the cancer cell comprises applying a first alternating electric field at a first frequency to a tumor target site comprising the cancer cell.

10 . A method of imaging a cancer or tumor cell in a subject, the method comprising applying a first alternating electric field at a first frequency of 25 kHz to 1 MHz to the cancer or tumor cell for a first period of time, wherein application of the first alternating electric field at the first frequency of 25 kHz to 1 MHz to the cancer or tumor cell for the first period of time increases permeability of cell membranes of the cancer or tumor cell; introducing a conductive nanoparticle to the cancer or tumor cell, wherein the increased permeability of the cell membranes enables the conductive nanoparticle to cross the cancer or tumor cell membrane; imaging the cancer or tumor cell; applying a second alternating electric field at a second frequency to the cancer or tumor cell for a second period of time, wherein the second frequency is different from the first frequency.

11 . The method of claim 10 , wherein the conductive nanoparticle alters the electric impedance in the cancer or tumor cell and/or wherein the second alternating electric field at the second frequency reduces viability of the cancer or tumor cell.

12 . The method of claim 10 wherein the conductive nanoparticles are decorated with Gd3+, decorated with gadolinium-based contrast agent, or decorated with radioisotopes.